Selection and Application Guide
Type VBII
safety
You Asked for It. Murray Listened.
Contents
Features
4
Genral Duty Plug Fuse Type
5
General Duty Switches
Features
6
General Duty Types
7
Heavy Duty Switches
Features
8-9
Heavy Duty Types
10-12
Accessories
13-14
Hub and Lug Data
We asked contractors for everything they wanted in an enclosed safety
switch.Their input helped create the toughest, most reliable, most hassle-free
enclosed safety switch in the business - the Murray Type VBII Safety Switch.
It’s a switch that’s right for any commercial, industrial or special use
application. The Murray Safety Switch line offers a list of important features
that gives contractors a competitive edge:
•
•
•
•
•
Highly visible, easy-to-grip red handle
Visible blade construction
Door that opens greater than 180º
Quick-make, quick-break mechanism
All copper current carrying parts on heavy duty
switches (except wire grips)
• Positive two- and three-point mounting
15
Ratings
Heavy Duty
Protector-Lock Type
16
Feature Comparison
17
Double Throw Switches
18-19
Detailed Dimension Drawings
20-33
Replacement Parts
34
Fuse Application & Selection
35
Fuse Application & Dimensions
36-37
Ratings & Test Requirements
38-39
Catalog Numbering System
2
40
•
•
•
•
•
•
•
•
•
30-1200 Amps
240 and 600 Volts AC
250 and 600 Volts DC
100 AlC for general duty switches
200 AlC for heavy duty switches
Design E horsepower rated
Suitable for use as service equipment
Provisions for UL Class T, R, J, L, and H fuses
12X overload rating that exceeds industry
standard of 10X
One Tough Switch - Murray Type VBII Safety Switch
closed
in operation
Murray now offers
a complete line of
enclosed switches
featuring unique and
innovative designs that
are unparalleled in the
industry.
General and Heavy
Duty Switches Feature
a Double Break Design
The Murray VBII double-break
switching action breaks the arc
in two places. This reduces heat
generation and increases switching
speed by doubling the breaking
distance. The result is enhanced
performance and increased longevity. We also provide the most
visible blade design available today.
Unlike conventional knife blade
switches, the blades are selfaligning to ensure positive contact.
In addition, they have no wear and
friction point since the “electrical
hinge” has been eliminated. The
result is a very fast, positive and
reliable switching action for even
the most severe applications.
One Tough Switch:
More Rugged and Durable
in Demanding Applications
Our engineers tackled the problem
of designing a switch that would
stand up under the most demanding
industrial conditions, such as steel
mills and mining operations. These
environments require a switch that
must work reliably and safely in the
midst of falling liquids, airborne
fibers, dust, metal particles,
coolants and other contaminants.
Tested and Retested
All Murray safety switches have
been tested to meet all UL requirements and well beyond. These tests
include those for general purpose
enclosed switches and those
designed for more specialized
purposes where applicable.
The result is a rugged, reliable
design that will provide superior
performance in a wide variety
of applications.
open
3
General and Heavy Duty Features
Murray Type VBII Safety Switch
Application
General Duty Switches
General Duty Switches are intended
for applications where reliable
performance and continuity of
service are needed, but where duty
requirements are not severe and
usual service conditions prevail.
(These switches are intended for
use primarily with supply circuits
rated 240V AC or less where the
available fault current is less than
100,000A when used with Class
R or T fuses or 10,000A max.
when used with Class H fuses.)
Application
Heavy Duty Switches
Heavy Duty Switches are intended
for use in applications where:
1. Rugged construction, reliable
performance, continuity of service
and ease of maintenance are
emphasized, or
2. Available fault currents higher
than 10,000A are likely to be
encountered, such as in manufacturing plants, mass production
industries, and commercial, institutional and other large buildings
served by network systems or
transformers of higher capacities.
3. System voltage is 600V AC
or DC Max.
4. A Type 12 or 4 / 4X enclosure
is required.
Short Circuit Withstand Ratings
General Duty Switches
Suitable for use on systems capable
of delivering not more than
100,000 RMS symmetrical amperes
of fault current when Class R fuses
are installed. Also rated 100,000
AC max. In 200-600A ratings with
Class J and T fuses.
Short Circuit Withstand Ratings
Heavy Duty Switches
Suitable for use on systems capable
of delivering not more than
200,000 RMS symmetrical amperes
of fault current when Class J or R
fuses are installed except the 800
and 1200A switches, which are
suitable for use on circuits capable
of delivering not more than
200,000 RMS symmetrical amperes
of fault current when Class L fuses
are installed. 100-1200A switches
with Class T fuses and field
adapter kit are also 200,000 RMS
symmetrical rated.
4
Fuses
General Duty Switches
Fusible switches will accept
the following UL class fuses:
Class H
Class K
Class R - Class R fuse clip rejecter
kits are required.
Class T - 200-600A switches (200A
switches require field adapter kit).
Heavy Duty Switches
Fusible switches will accept the following UL class fuses:
Class H
Class K
Class R - Class R fuse clip rejecter
kits are required.
Class J - 240 and 600V switches.
All switches are field convertible.
Class L - 800 and 1200A switches
only.
Class T - 100-1200A switches (100
and 200A switches require an
adapter kit).
Cover Interlocks
General Duty Switches
Defeatable-cover interlocks on Type
1 switches and 60-600A Type 3R
switches prevent the switch door
from being opened when in the
“ON” position.
Heavy Duty Switches
Defeatable dual cover interlocks are
standard on all heavy duty switches. Prevents cover from being
opened when switch is in the “ON”
position and prevents switch from
being turned “ON” when door is
opened.
Underwriters’ Laboratories, Inc.
Listed by UL under file #E4776
per standard UL98 for enclosed
switches and also suitable for use
as service equipment.
NEMA Specifications
Meets NEMA standard KS-1-1990
for type GD and HD switches.
General Duty Switches
Plug Fuse and Special Application Types
Features➃
• Compact size
• Visible blade, double-break
switching action
• Quick-make, quick-break
operating mechanism
• Highly visible ON/OFF indicators
• Padlock-off handle feature
• Door padlock provision
• Bondable neutral (where indicated)
• Lugs suitable for copper or
aluminum wire
• 30A cartridge fuse switches rated
100,000 AC with Class R fuses
Ampere
Rating
Catalog
Number
Indoor-Type 1
Ship.
Wgt.*➀
Dwg.
Fig.
Catalog
Number
Outdoor-Type 3R
Ship.
Wgt.*➀
Dwg.
Fig.
—
—
—
Horsepower Ratings➄
1-Phase, 2-Wire
Std.
Max.
120/240 Volt Fusible (Plug Fuse Type) 10,000 AIC Max
1-Pole and Solid Neutral
30
120 Volt - 1-Phase, 2-Wire
GP211N
31
1
2-Pole and Solid Neutral
30
1/2
2
120/240V - 1-Phase, 3-Wire
GP321N
37
1
GP321NW
35
12
1 1/2 3
35
11➁
—
3
36
11➁
—
10
240 Volt Non-Fusible (Special Application)
2-Pole 240 Volt - 1- or 2-Pole - No Fuse
240 Volt - 1 Phase, 2 Wire
30
GU221
33
1
GU221AW➁
60
—
—
—
GU222AW➁
Steel AC Disconnects 1ø, Outdoor – Type 3R➁➂
Ampere
Rating
Disconnect
Type
Catalog No.
Horse Power
Rating
Height
Dimensions (Inches)
Width
Depth
30
60
60
60
Fused Pullout
Fused Pullout
Non-fused Pullout
Non-automatic Switch
PE230F
PE260F
PE260N
PE260NAS
2
10
10
10
7 1/4
9
7 1/4
7 1/4
5
5
5
5
2 1/8
2 1/8
2 1/8
2 1/8
Height
Dimensions (Inches)
Width
Depth
5 3/4
5 3/4
5
3 1/8
3 1/8
2 1/8
Plastic AC Disconnects 1ø, Outdoor – Type 3R➁
Ampere
Rating
Disconnect
Type
Catalog No.
Horse Power
Rating
30
60
60
Fused Pullout
Fused Pullout
Non-fused Pullout
PE230FPL
PE260FPL
PE260NPL
3
10
10
* In pounds (lbs).
➀ Package of 10.➁ No hub provision with this switch.
➂ Steel AC disconnects with a 15A GFCI receptacle are also available.
8
8
7 1/4
➃ Features apply to 30A General Duty and Plug Fuse Type Switches.
➄ Dual horsepower ratings:
Std.- applies when non-time delay fuses are installed.
Max.- applies when time delay fuses are installed.
5
General Duty Switches-Features (60-600A)
11
5
9
3
6
10
1
8
4
7
2
12
1. Cover interlock
2. Tangential knockouts through
600A for easy conduit lineup
3. Quick-make, quick-break operating mechanism that ensures
positive operation
4. Provisions for T, R, J, H, and
K class fuses (T & J 200-600A)
5. Generous wiring gutters that
meet or exceed NEC wirebending space requirements
6. Visible blade, double-break
switch action
7. Positive 2 or 3 point mounting
8. Highly visible red handle grip
9. Informative door labeling
which includes replacement
parts list
6
10. Handle and cover
padlocking provisions
11. Side-hinged door that opens
180 degrees for easier wiring
12. A unique enclosure design that
adds rigidity and strength. Its
rolled edge prevents cuts and
scrapes to conductors and to
installer’s hands
General Duty Switches
Indoor - Type 1
System
Ampere
Rating
Catalog
Number
Ship.
Wgt.*
Horsepower Ratings➀
240 Volt AC
Outdoor - Type 3R
Dwg.
Fig
Catalog
Number
Ship.
Wgt.*
1
4
6
7
9
9
9
9
GHN321NW
GHN322NW
GHN323NW
GHN324NW
GHN325NWH➂
GHN325NW
GHN326NWH➂
GHN326NW
35 (10)
14
24
48
130
157
135
159
Dwg.
Fig.
1-Phase, 2-Wire
2-Phase, 4-Wire
3-Phase, 3-Wire
250
Volt
DC
Std.
Max.
Std.
Max.
11
14
16
17
19
19
19
19
1 1/2
3
7 1/2
15
—
—
—
—
3
10
15
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
24 (5)
15
25
50
12
14
16
17
1 1/2
3
7 1/2
15
3
10
15
—
—
—
—
—
—
—
—
—
3
7 1/2
15
25
7 1/2
15
30
60
5
10
20
40
138
162
19
19
—
—
—
—
—
—
—
—
50
50
125
125
141
165
19
19
—
—
—
—
—
—
—
—
75
75
200
200
50
50
—
—
24 (5)
13
24
47
12
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
7 1/2
Std.
Max.
Std.
240 Volt Fusible
2-Pole, 2-Fuse and Solid Neutral➁
30
GHN321N 35 (10)
60
GHN322N
14
100
GHN323N
23
200
GHN324N
47
400
GHN325NH➂
128
400
GHN325N
153
600
GHN326NH➂
133
600
GHN326N
159
240 Volt AC / 250 Volt DC
3-Pole, 3-Fuse and Solid Neutral
30
60
100
200
400
400
600
600
GHN421N
GHN422N
GHN423N
GHN424N
GHN425NH➂
GHN425N
GHN426NH➂
GHN426N
3
7 1/2
15
25
50
50
75
75
7 1/2
15
30
60
125
125
200
200
5
10
20
40
50
50
—
—
240 Volt AC / 250 Volt DC
24 (5)
15
25
49
2
4
6
7
136
158
9
9
138
161
9
9
GHN421NW
GHN422NW
GHN423NW
GHN424NW
GHN425NWH➂
GHN425NW
GHN426NWH➂
GHN426NW
24 (5)
12
23
46
2
3
6
7
GUN321AW
GUN322AW
GUN323AW
GUN324AW
240 Volt Non-Fusible
2-Pole or 3-Pole
30
60
100
200
240 Volt AC / 250 Volt DC
GUN321
GUN322
GUN323
GUN324
13
16
17
15
30
60
—
—
—
—
5
10
20
40
* In pounds (lbs).
➀ Dual horsepower ratings: Std.- applies when non-time delay fuses are installed. Max.- applies when time-delay fuses are installed.
➁ These switches are UL-listed for application on grounded B-phase systems.
➂ Height reduced switch (45.25 rather than 56 inches in height) for use with 500 MCM or smaller conductors.
7
Heavy Duty Switches
Features
15
3
2
4
18
6
1.
Quick-make, quick-break operating mechanism
that ensures positive operation
2.
Visible blade, double-break switching action
3.
Arc chutes dissipate heat and prolong switch life
4.
Highly visible red handle grip. Designed for hook stick
operation
5.
Defeatable dual cover interlock
6.
Center punch provided for field drilling to allow
ON padlocking
7.
Handle can be padlocked in the OFF position
with up to (3) padlocks with 5/16” hasps
8.
Generous top, bottom, and side gutters that meet
or exceed NEC wire-bending space requirements
9.
Informative door labeling which includes
replacement parts list
10. Tangential knockouts through 200A for easy conduit
lineup
11. Side-hinged door that opens past 180 degrees for easier
wiring
12. Unique enclosure design increases rigidity and prevents
cuts and scrapes to conductors and installer’s hands
13. Spring reinforced fuse clips that assure reliable contact
for cool operation
14. Door latch securely holds door closed and allows cover
padlocking
7
15. Front removable mechanical lugs that are suitable
for CU/AI 60 or 75º conductors
16. Lugs are field convertible to copper body and
to a wide variety of compression connectors
17. Hinged clear line terminal shield with probe holes
for inspecting or testing line side terminals
18. Large nameplate on Heavy Duty Switches
provides highly visible ON/OFF indication
10
19. Drawn cover for increased rigidity and resistance to abuse
20. Top key hole and bottom mounting holes provide easy
2 or 3 point mounting
8
20
11
17
16
9
1
5
13
19
8
14
12
9
Heavy Duty Switches
Horsepower Ratings➁
Indoor - Type 1
System
Ampere
Rating
Catalog
Number
Outdoor - Type 3R
Ship.
Wgt.*
Dwg.
Fig.
Catalog
Number
12
18
23
47
129
153
134
155
360
362
4
5
6
7
9
9
9
9
10
10
HHN321NW
HHN322NW
HHN323NW
HHN324NW
HHN325NWH➀
HHN325NW
HHN326NWH➀
HHN326NW
—
—
14
19
25
49
137
158
139
161
380
382
4
5
6
7
9
9
9
9
10
10
HHN421NW
HHN422NW
HHN423NW
HHN424NW
HHN425NWH➀
HHN425NW
HHN426NWH➀
HHN426NW
HLN427NW
HLN428NW
Ship.
Wgt.*
240 Volt AC
Dwg.
Fig.
1-Phase, 2-Wire
Std.
Max.
2-Phase, 4-Wire
Std.
Max.
3
10
15
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
1 1/2
3
7 1/2
15
—
—
—
—
—
—
3
10
15
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
250
3-Phase, 3-Wire
Std.
Max.
Volt
DC
240 Volt Fusible
2-Pole, 2-Fuse and Solid Neutral➂
30
60
100
200
400
400
600
600
800
1200
HHN321N
HHN322N
HHN323N
HHN324N
HHN325NH➀
HHN325N
HHN326NH➀
HHN326N
HLN327N
HLN328N
3-Pole, 3-Fuse and Solid Neutral
30
60
100
200
400
400
600
600
800
1200
C
240 Volt AC / 250 Volt DC
(Also used for 2-Pole, 2-Wire Applications)
13
19
24
48
131
157
135
159
362
364
14
15
16
17
19
19
19
19
—
—
1 1/2
3
7 1/2
15
—
—
—
—
—
—
(Also used for 3-Pole, 3-Wire Applications)
HHN421N
HHN422N
HHN423N
HN424N
HHN425NH➀
HHN425N
HHN426NH➀
HHN426N
HLN427N
HLN428N
15
20
26
50
138
162
142
165
383
385
14
15
16
17
19
19
19
19
20
20
3
7 1/2
15
25
50
50
75
75
100
100
7 1/2
15
30
60
125
125
200
200
250
250
5
10
20
40
50
50
—
—
—
—
240 Volt AC / 250 Volt DC
3
7 1/2
15
25
50
50
75
75
100
100
7 1/2
15
30
60
125
125
200
200
250
250
5
10
20
40
50
50
50
—
—
—
240 Volt Fusible (For 2-Pole Applications use outside poles of 3-Pole Switches)
3-Pole, 3-Fuse➃
Type 4 / 4X Stainless
30
60
HHN321AS
HHN322AS
14
20
22
23
Type 12 Industrial
—
—
—
—
240 Volt AC / 250 Volt DC
—
—
* In pounds (lbs).
➀ Height reduced switch (45.25 rather than 56 inches in height) for use with 500 MCM or smaller conductors..
➁ Dual horsepower ratings: Std.- applies when non-time delay fuses are installed. Max.- applies when time-delay fuses are installed.
➂ These switches are UL-listed for application on grounded B-phase systems.
➃ Also used for 2-pole, 2-wire applications.
10
3
7 1/2
7 1/2
15
—
10
Heavy Duty Switches
Horsepower Ratings ➂
Indoor - Type 1
System
Ampere
Rating
Catalog
Number
Ship.
Wgt.*
Outdoor - Type 3R
Dwg.
Fig.
Catalog
Number
Ship.
Wgt.*
480 Volt AC
Dwg.
Fig.
1-Phase, 2-Wire
Std.
Max.
3-Phase, 3-Wire
Std.
Max.
600 Volt AC
250
600
1-Phase, 2-Wire 3-Phase, 3-Wire
Volt
Volt
DC
DC
Std.Max.
Std.
Max.
600 Volt Fusible
(Also used for 2-Pole, 2-Wire Applications)
3-Pole, 3-Fuse
30
60
100
200
400
400
600
600
800
1200
HHN361
HHN362
HHN363
HHN364
HHN365H➁
HHN365
HHN366H➁
HHN366
HLN367
HLN368
14
19
24
48
136
154
138
157
380
383
4
5
6
7
9
9
9
9
10
10
HHN361AW
HHN362AW
HHN363AW
HHN364AW
HHN365AWH➁
HHN365AW
HHN366AWH➁
HHN366AW
HLN367AW
—
15
20
25
49
137
157
141
161
382
—
14
15
16
17
19
19
19
19
20
—
3
5
10
25
—
—
—
—
—
—
7 1/2
20
30
50
—
—
—
—
—
—
14
19
4
5
HHN461NW
HHN462NW
15
20
14
15
3
5
7 1/2
20
5
15
25
50
100
100
150
150
200
200
15
30
60
125
250
250
400
400
500
500
5
15
15
30
—
—
—
—
—
—
—
—
5
15
25
50
15
30
60
125
3
10
15
30
—
—
—
—
—
—
10
25
40
50
—
—
—
—
—
—
7 1/2
15
30
60
125
125
200
200
250
250
20
50
75
150
350
350
500
500
500
500
5
10
20
40
50
50
—
—
—
—
—
25
25
50
—
—
—
—
—
—
20
50
5
10
—
25
480 Volt AC / 600 Volt AC / 250 Volt DC ➀
3-Pole, 3-Fuse and Solid Neutral
30
60
480 Volt AC / 600 Volt AC / 250 Volt DC ➀
—
—
3
10
10
25
7 1/2
15
600 Volt Fusible (For 2-Pole Applications use outside poles of 3-Pole Switches)
3-Pole, 3-Fuse
Type 4 / 4X Stainless
30
60
100
200
HHN361AS
HHN362AS
HHN363AS
HHN364AS
13
20
25
49
22
23
24
25
480 Volt AC / 600 Volt AC / 250 Volt DC ➀
Type 12 Industrial
HHN361AJ
HHN362AJ
HHN363AJ
HHN364AJ
14
20
25
49
22
23
24
25
—
—
—
—
—
—
—
—
7 1/2
15
30
60
20
50
75
150
5
10
20
40
—
25
25
50
* In pounds (lbs).
➀ 60-200A 3-Pole switches are also rated 600V DC when 2 poles are connected in series. Consult factory for 30A, 600V DC switches.
➁ Height reduced switch (45.25 rather than 56 inches in height) for use with 500 MCM or smaller conductors.
➂ Dual horsepower ratings: Std.- applies when non-time delay fuses are installed. Max.- applies when time-delay fuses are installed.
11
Heavy Duty Switches
Indoor - Type 1
System
Ampere
Rating
Catalog
Number
Ship.
Wgt.
Outdoor - Type 3R
Dwg.
Fig.
Catalog
Number
Ship.
Wgt.
Horsepower Ratings
Dwg.
Fig.
480 Volt
240 Volt
1-Phase
3-Phase 1-Phase
600 Volt
3-Phase 1-Phase
3-Phase
250V
600V
DC
DC
600 Volt Non-Fusible
3-Pole
480 Volt AC / 600 Volt AC / 250 Volt DC ➀
(Also used for 240 Volt AC and 2-Pole, 2-Wire Applications)
30
60
100
200
400
600
600 Volt Non-Fusible
3-Pole
HUN361
HUN362
HUN363
HUN364
HUN365
HUN366
12
18
23
46
114
116
3
5
6
7
8
8
13
19
24
47
118
120
13
15
16
17
18
18
3
10
15
15
15
15
10
20
40
60
125
200
7 1/2
20
30
50
50
50
3
10
15
15
15
10
20
40
60
—
7 1/2
20
30
50
50
20
50
75
125
250
400
10
25
40
50
50
50
HUN361AS
HUN362AS
HUN363AS
HUN364AS
—
13
19
24
47
—
21
23
24
25
—
5
10
20
40
50
—
—
25
25
50
—
—
480 Volt AC / 600 Volt AC / 250 Volt DC ➀
Type 12 Industrial
HUN361AJ
HUN362AJ
HUN363AJ
HUN364AJ
HUN365AJ
13
19
24
47
119
21
23
24
25
26
20
50
75
125
250
10
25
40
50
50
➀ 60-200A 3-Pole switches are also rated 600V DC when 2 poles are connected in series. Consult factory for 30A, 600V DC switches.
12
30
60
100
150
350
500
(Also used for 240 Volt AC and 2-Pole, 2-Wire Applications)
Type 4/4X Stainless
30
60
100
200
400
HUN361AW
HUN362AW
HUN363AW
HUN364AW
HUN365AW
HUN366AW
30
60
100
150
350
5
10
20
40
50
—
25
25
50
—
General and Heavy Duty
Accessories
Class J Fuse
All 200-600A General Duty and
30-600A, 600V Heavy Duty
Switches are field convertible to
accept Class J fuses by moving
the load base to a pre-drilled
J fuse position.
HN612M
Neutral Kits
Standard Neutral Kits can be field
installed in General and Heavy Duty
Switches.
Neutral Kits
HT63M
Class T Fuse Adapter Kits
All 200-600A, General Duty and
100-1200A Heavy Duty Switches
are field convertible to accept Class
T fuses. 400 & 600A switches are
field convertible to accept Class T
fuses by moving the load base to
a pre-drilled T fuse position.
Switch
Ampere
Rating
Kit
Catalog
Number
30 GD
W410190M
30 HD, 60 GD
HN612M
60, 100 HD, 100 GD
HN623M
200
HN64M
400 & 600
HN656M
800 & 1200 VBII
HN678M
Class T Fuse Adapter Kits ➀
Catalog
Number
Description
HT23M
100A, 240V Kit
HT63M
100A, 600V Kit
HT24M
200A, 240V Kit
HT64M
200A, 600V Kit
HX327TF
800A, 240V Kit
HX367TF
800A, 600V Kit
HX328TF
1200A, 240V Kit
➀ One kit per pole required.
13
General and Heavy Duty
Accessories
HA261234M
HA161234M
Auxiliary Contacts
Auxiliary Contacts are available only for Heavy Duty Switches. The auxiliary
contacts are available in 1 normally open and 1 normally closed or 2
normally open and 2 normally closed configurations. All auxiliary contacts
make after and break before main switch contacts.
Auxiliary Contacts
Switch
Ampere
Rating
Aux. Switch
Catalog
Number
Kit Ampere Rating
125V AC
250V AC
28V DC
Max.
Max.
Max.
Kit Horsepower Rating
125V AC
250V AC
28V DC
Max.
Max.
Max.
With 1 NO & 1 NC Isolated Contacts
30-200
HA161234M
10
10
–
1/2
3/4
–
400-1200
HA165678M
10
10
–
1/2
3/4
–
With 2 NO & 2 NC Isolated Contacts
30-200
HA261234M
10
10
7
1/2
3/4
–
400-1200
HA265678M
10
10
7
1/2
3/4
–
Equipment Ground Kits
Equipment Ground Lug Kits are available for all General and Heavy Duty
Switches. They are field installable in Type 1 and Type 3R Switches and are
factory installed as standard in Type 4 / 4X and Type 12 Switches.
Equipment Ground Kits
Switch
Ampere
Rating
Catalog
Number
Number of
Terminals
30A GD
GSGK60M
2
#14-8 AWG
60-200 GD
HG61234M
2
#14-4 AWG
30-200 HD
HG61234M
2
#14-4 AWG
400 & 600
HG656M
4
#14-2/0 AWG
800-1200
HG678M
8
#6 AWG-250 Kcmil
Class R Fuse Clip Kits
All 30-600A General Duty and
Heavy Duty Switches are field
convertible to accept Class R Fuse
Clip Kits. The kits prevent the
installation of Class H and
K fuses (one kit
required per
switch).
Wire Range
Per Terminal (Cu/Al)
Class R Fuse Clip Kits
Catalog
Number
Description
GSRK321M
30A, 240V Kit (GD only)
HR21M
30A, 240V Kit (HD only)
HR612M
30A, 600V Kit / 60A, 240V Kit
HR62M
60A, 600V Kit
HR63M
100A Kit
HR64M
200A Kit
HR612M
HR656M
14
400A / 600A Kit
General and Heavy Duty
Hub and Lug Data / Protector - Lock
ECHS200
Kirk-Key Interlocks
Kirk-Key Interlocks can be factoryinstalled only on Type VII Heavy Duty
and Double Throw Safety Switches.
ECHV300
Interchangeable Hubs
30-200A Type 3R Switches are
provided with a conduit hub
provision and a removable hub
plate on their top rainshed.
Hubs
Conduit
Size
(inches)
Catalog
Number
Used On
Type 3R ➀
3/4
1
1 1/4
3/4
1
1 1/4
1 1/2
2
2 1/2
2 1/2
3
3 1/2
4
ECHA075
ECHA100
ECHA125
ECHS075
ECHS100
ECHS125
ECHS150
ECHS200
ECHS250
ECHV250
ECHV300
ECHV350
ECHV400
Compact and
30A GD Only
Interlocks can be used to prevent
the authorized operator from
making an unauthorized operation.
The interlock system is a simple
method of applying key interlocks
to safety switches so as to require
operation in a predetermined
sequence.
Before consulting the factory, the
following information is required:
• User name and address
• Key number from lock assemblies
on any existing locks to be
interlocked with
• Complete locking scheme.
Consult factory for delivery.
60-200A GD
30-200A HD
400-1200A
Lugs
30-100A Switches are suitable
for use with 60º or 75ºC wire.
100-1200A are suitable for use
with 75ºC rated wire.
Wire Ranges (Line, Load and Standard Neutral)
Switch
Ampere
Rating
Wire Range with
Wire-Bending Space
Per NEC Table 373-6
Lug Wire Range
30GD
#14-8 AWG (Cu/Al)≠
30HD
#12-6 AWG (Al) or #14-6 AWG (Cu/Al)
#14-2 AWG (Cu/Al)
#14-3 AWG (Cu/Al)
#14-2 AWG (Cu/Al)
60➂
#14-8 AWG (Cu/Al)
100
#14-1/0 AWG (Cu/Al)
#14-1/0 AWG (Cu/Al)
200➃
#6 AWG-250 Kcmil (Cu/Al)
#6 AWG-300 Kcmil (Cu/Al)
400➄
1/0 AWG-750 Kcmil (Cu/Al) or
(2) 1/0 AWG-250 Kcmil (Cu/Al)
(1) 1/0 AWG-750 Kcmil (Cu/Al) or
(2) 1/0 AWG-250 Kcmil (Cu/Al)
600➄
(2) 1/0 AWG-750 Kcmil (Cu/Al) or
(4) 1/0 -250 Kcmil (Cu/Al)
(2) 1/0 AWG-750 Kcmil (Cu/Al) or
(4) 1/0 AWG-250 Kcmil (Cu/Al)
800
(3) 1/0 AWG-750 Kcmil (Cu/Al) or
(6) 1/0 AWG-250 Kcmil (Cu/Al)
(4) 1/0 AWG-750 Kcmil (Cu/Al) neutral
(4) 1/0 AWG-750 Kcmil (Cu/Al)
(3) 1/0 AWG-750 Kcmil (Cu/Al) Line and Load
(4) 1/0 AWG-600 Kcmil (Cu/Al) neutral
1200
NOTE: 30 thru 200A, Type 3R Switches have
removable hub plates on rainshed. 400A and
larger Type 3R Switches have no provisions
for mounting hubs. Drill or punch hole in the
field to accommodate hub size desired.
(4) 1/0 AWG-750 Kcmil (Cu/Al) Line and Load
(4) 1/0 AWG-750 Kcmil (Cu/Al) neutral
➀
➁
➂
➃
➄
Hubs suitable for 3R Switches.
Line lugs are UL approved and have wire-bending space for #14 - 6 conductors.
60A HD switches are also UL approved for #2 Cu/Al conductors.
200A HD switches have a wire range & wire bending space for (1) 6-300 Kcmil (Cu/Al).
Max. wire size for height reduced 400&600A switches is 500 Kcmil (Cu/Al).
15
Heavy Duty
Protector-Lock® / Interlocked Receptacle Switches
Application
Description ➀➁
Receptacle Safety Switches provide
cord connection protection of
heavy-duty portable equipment
(welders, infrared ovens, batch
feeders, portable conveyors,
assembly line fixtures and tools,
refrigerator trucks, etc.) under
load or fault conditions.
Type 12 receptacle Safety Switches
are available with 3-phase, 4-wire
grounded type Crouse-Hinds
Arkite™ or Arrow-Hart® receptacle
pre-wired and mounted with
interlock linkage to the switch
mechanism. Insertion or removal
of the plug is prevented by the
interlock linkage while the switch
is in the “ON” position. Receptacle
prevents operation of switch if
incorrect plug is inserted.
Protector-Lock Switches
with Arrow-Hart®, Power Lock® Receptacles
600V AC Fusible, 3-Pole in Type 12 Industrial Enclosure ➂➃
Ampere Rating
Catalog
Number
Shipping
Weight
Use Plug #
Switch
Recept.
30
30
HHN361KJ
17
AX103S, 20415S
60
30
HHN362KJ➁
17
AX103S, 20415S
60
60
HHN362LJ
17
26415S
with Crouse-Hinds® Receptacles
600VAC Fusible, 3-Pole in Type 12 Industrial Enclosure ➂➃
Ampere Rating
Switch
Recept.
60
60
Catalog
Number
HHN362CJ
Shipping
Weight
Use Plug #
30
AP6485
600V AC Non-Fusible, 3-Pole in Type 12 Industrial Enclosure ➃
Ampere Rating
16
Switch
Recept.
60
60
Note: Protector-Lock® is a registered trademark of Siemens Energy &
Automation, Inc. Arrow-Hart®, Power Lock® and Crouse-Hinds® are
registered trademarks of Cooper Industries, Inc.
Catalog
Number
HUN362CJ
➀
➁
➂
➃
Shipping
Weight
Use Plug #
29
APJ6485
Arkite™ is a registered trademark of the Crouse-Hinds Company.
Not UL-listed.
See page 14 for Class R Fuse Clip Kits.
Also rated Type 3R/3S.
Feature Comparison
General
Duty
Heavy
Duty
Double
Throw
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
Underwriters’ Laboratories Inc.
Listed by UL under file #E4776 as
enclosed switches and also suitable
for use as service equipment except
on 1200A switches on Y systems of
more than 150V to ground.
✓
✓
✓
✓
✓➂
Meets UL98 standard for enclosed
switches and enclosures
Type 1 switches—general purpose
enclosures (Type 1)
Type 3R switches—rainproof
enclosures (Type 3R)
Type 4 / 4X switches—special
purpose enclosures (Type 4/4X)
Type 12 switches—special
purpose enclosures (Type 12).
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
➅
✓
✓
✓
✓
✓
✓
✓
✓➆
✓
✓
✓➃
✓
✓
✓
✓
✓
✓➀
✓➀
✓
✓
✓
Groundable Neutrals
General & Heavy Duty Switches
Switches designed for use on
systems requiring neutrals have
groundable neutral blocks.
Padlocks
General & Heavy Duty Switches
Padlockable cover latch and multiple
padlock provisions on handle.
✓
✓➆
✓➄
➀
➁
➂
➃
➄
➅
➆
✓
Features / Ratings
30 thru 600 Amps
800 and 1200 Amps
240 Volts AC
600 Volts AC
250 Volts DC
600 Volts DC
Double-break visible blade design
(30-200A)
Quick-make, quick-break switching action
Highly visible ON/OFF handle indication
Handle design for hook stick operation
Padlockable cover latch
Padlockable handle
Single voidable cover interlock
Dual voidable cover interlock
Type 1 enclosure
Type 3R enclosure
Type 12 enclosure
Type 4/4X enclosures
Generous wiring gutters that meet UL and
NEC wire-bending space requirements
Lugs suitable for copper or aluminum
at 60˚C or 75˚C
CU/AL wire lugs that meet
UL 486B requirements
Suitable for field-convertible
compression connectors
All plated copper current carrying parts
(except lugs)
Spring reinforced Fuse Clips ➁
(except 30A general duty)
Clear pivoting line terminal shield
Replacement parts
Provisions for UL Class T, R and H fuses
Provisions for UL Class J and L fuses
Aux. switch kit
Type 4X with stainless steel interior parts
Rolled flange enclosure design (30-200A)
UL approved HP ratings for
high efficiency motors
400 & 600A fusible, double-throw switches accept only Class J or T fuses.
30A general duty switches have fuse clips constructed of spring type copper.
Not supplied on 30A outdoor & plug fuse switches.
30-200A Type VBII in stainless steel enclosures.
60-200A
200A general duty switches have aluminum neutral assemblies.
100-600A GD and 100-1200A HD switches will accept Class T fuses
17
Double Throw Switches
Application
Double Throw Safety Switches
are supplied from the factory to
provide a manual transfer means
from normal to an alternate power
source. They can also be used to
connect a single source of power to
either of two loads. They are commonly used in residential,
commercial and light industrial
applications when a means to
switch to alternate power supply
is needed and automatic transfer
is not required.
Description
Double throw switches are suitable
for use as service equipment,. All
are UL listed. Switches are rated for
use on sytems up to 10,000A when
protected with Class H fuses or
200,000A when protected with
Class R or Class T fuses➁. They can
also be used to connect a single
source of power to either of two
loads. In this application it is necessary to field modify fusible switches
so that the fuses are on the load
side of the switching mechanism.
A cover interlock is provided on all
ampere ratings. The operating
handle may be padlocked in the
OFF position.
System
Amps
①
Type 1
¨Type 3R①
Catalog Number Catalog Number
System
Amps
240 VAC - 250 VDC/3-Pole
Fusible
ON
OFF
ON
Fuse Type
H
R
Std Yes (kit)
Std Yes (kit)
Std Yes (kit)
HDHN321
HDHN322
HDHN323
HDHN324
HDHN325
HDHN321AW
HDHN322AW
HDHN323AW
—
—
①
Type 3R①
Catalog Number
—
—
—
—
—
—
—
—
—
—
(3-pole
shown)
System
Amps
NonFusible
30
60
100
200
400
Fuse Capabilities of Fusible Switches
Amp
Rating
30 & 60A, 240V
30 & 60A, 600V
100 & 200A
30
60
100
200
400
Type 1
Catalog Number
240 VAC - 250 VDC/2-Pole
HDUN221
HDUN222
HDUN223
HDUN224
HDUN225
—
—
—
HDUN224AW
HDUN225AW
240 VAC - 250 VDC/3-Pole
HDUN321
HDUN322
HDUN323
HDUN324
HDUN325
—
—
HDUN323AW
HDUN324AW
—
—
—
—
—
—
—
—
—
—
—
—
—
ON
OFF
T
J
No
No
No
Yes➂
Yes (kit) Yes➂
ON
(3-pole
shown)
Amps
30
60
100
200
400
600
600 VAC/3-Pole
HDUN361
HDUN362
HDUN363
HDUN364
HDUN365
—
HDUN361AW
HDUN362AW
HDUN363AW
HDUN364AW
HDUN365AW
HDUN366AW
➀ Use ECHS type hubs for 30-200A switches (400&600A switches do not have hub provisions).
➁ Non-fusible double throw switches are rated 10,000 AIC when protected by a circuit breaker or Class H fuses
& 200,000 AIC when protected by Class R, J or T fuses.
➂ Move load bases.
18
Double Throw Switches
Horsepower Ratings, Lug Data and Accessories
Accessories
Catalog
Number
Description
Neutral
Kits
Ground lug,
Class R fuse
clip & aux.
switch kits
30A
60&100A
200A
400&600A
HNC612M
HN263M
HNC264M
HN678M
30-600A
Use kits
on page 14
Maximum Horsepower Ratings Fused (with Time Delay Fuses)
1-Phase AC
Ampere
Lug Data
240V
240V
30
3
7 1/2
5
60
10
15
10
100
15
30
20
200
15
60
40
400
—
125
50
No. of
Cables
Per
Terminal
Cu
and /or
Al
30
60
100
200
1 pc.
1 pc.
1 pc.
1 pc.
Cu or Al
Cu or Al
Cu or Al
Cu or Al
#14 to #6 AWG
#14 to #2 AWG
#12 to #1/0 AWG
#6 AWG to 250
Kcmil
400
2 pcs.
or
Cu or Al
#1/0 AWG to 250
Kcmil
Ampere
1 pc.
Cu or Al
250 to 750
Kcmil
2 pcs.
Cu or Al
250 to 500
Kcmil
30
60
100
200
400-600
Wire
Range
250V
Rating
Switch
Ampere
Range
600
3-Phase AC
DC
Maximum Horsepower Ratings Non-Fused
1-Phase AC
Rating
3-Phase AC
250V
240V
480V
600V
240V
480V
600V
DC
5
10
15
15
—
7 1/2
20
30
50
—
10
25
50
50
—
10
20
40
60
125
20
50
75
125
250
30
60
100
150
350
5
10
20
40
50
19
Detailed Dimension Drawings
Murray Type VBII Safety Switches
Type 1 (Indoor)
30 Amp General Duty (2-Pole)
30 Amp General Duty (3-Pole)
Figure 1
Knockout
Conduit
Code
SIZE
A (Concentric) .50
.75
B (Concentric) .50
.75
Figure 2
1.00
(
20
Dimensions shown in inches and millimeters [ ].
Dimensions shown accurate to + 1/8 inch.
(
Type 1 (Indoor)
30 Amp Heavy Duty Non-Fusible
60 Amp General Duty Non-Fusible
30 Amp Heavy Duty Fusible
60 Amp General Duty Fusible
Dimensions shown in inches and millimeters [ ].
Dimensions shown accurate to + 1/8 inch.
➀ Dimensions shown apply to heavy duty switches only.
Figure 3
Knockout
Conduit
Code
SIZE
A (Concentric) .50
.75
B (Tangential) .50
.75
1.00
Figure 4
21
Detailed Dimension Drawings
Murray Type VBII Safety Switches
Type 1 (Indoor)
60 Amp Heavy Duty
Figure 5
KNOCKOUT
CODE
A (Tangential)
.50
CONDUIT
SIZE
.75
1.00
100 Amp General and Heavy Duty
Figure 6
KNOCKOUT
CODE
A (Tangential)
.75
B (Tangential) 1.00
22
Dimensions shown in inches and millimeters [ ].
Dimensions shown accurate to + 1/8 inch.
➀ Dimensions shown apply to heavy duty switches only.
1.25
CONDUIT
SIZE
1.00 1.25
1.50
1.25
2.00
1.50
Type 1 (Indoor)
200 Amp General and Heavy Duty
Figure 7
KNOCKOUT
CODE
A (Tangential) 1.25
2.50
Figure 8
400 / 600 Amp General and Heavy Duty Non-Fusible
KNOCKOUT
CODE
A (Tangential)
Dimensions shown in inches and millimeters [ ].
Dimensions shown accurate to + 1/8 inch.
➀ Dimensions shown apply to heavy duty switches only.
CONDUIT
SIZE
1.50
2.00
CONDUIT
SIZE
2.00 2.50 3.00 3.50
23
Detailed Dimension Drawings
Murray Type VBII Safety Switches
Type 1 (Indoor)
400 / 600 General and Heavy Duty Fusible
Figure 9
14.68
[ 373 ]
24.65
[ 626 ]
2.07
[ 53 ]
13.44
[ 341 ]
20.50
[ 521 ]
9.23
[ 234 ]
2.50
[ 64 ]
18.77
E
[ 477 ]
39.00C
[ 991 ]
44.00B
[ 1118 ]
44.57
[ 1132A ]
DIMENSIONS
SWITCH TYPE
A
.43
(4)
.43DIADIA
[ (4)
11 ]
[ 11 ]
STANDARD
HEIGHT REDUCED
B
C
D
E
56.57[1437] 56.07[1424] 51.00[1295] 25.46[647] 18.77[477]
45.82[1164] 45.31[1151] 40.25[1022] 20.99[533] 12.49[317]
13.46D
[ 342 ]
KNOCKOUT
CODE
A
13.25
[ 337 ]
CONDUIT
SIZE
2.00 2.50 3.00 3.50
Figure 10
800 / 1200 Amp Heavy Duty Fusible
14.68
[ 373 ]
38.40
[ 975 ]
3.20
3.20
81 ]]
[[ 81
2.79
2.79
71 ]]
[ [71
13.44
[ 341 ]
32
32
813 ] ]
[[ 813
24.02
[ 610 ]
40.00
40.00
1016 ] ]
[ [1016
9.24
[ 236 ]
67.16
67.16
[ 1706 ]]
[ 1706
61.25
[ 1556 ]
66.67
66.67
1693 ]]
[ [1693
.25
[ 6]
30.46
[ 774 ]
.56 Dia (4)
[ 14 ]
13.25
13.24
337] ]
[[ 336
24
Dimensions shown in inches and millimeters [ ].
Dimensions shown accurate to + 1/8 inch.
No knockouts in the enclosures.
Type 3R (Outdoor)
30 Amp General Duty (2-Pole)
30 Amp General Duty (3-Pole)
Dimensions shown in inches and millimeters [ ].
Dimensions shown accurate to + 1/8 inch.
Figure 11
KNOCKOUT
CONDUIT
CODE
SIZE
A (Concentric) .50
.75
B (Concentric) .50
.75
1.00
Figure 12
25
Detailed Dimension Drawings
Murray Type VBII Safety Switches
Type 3R (Outdoor)
30 Amp Heavy Duty Non-Fusible
60 Amp General Duty Non-Fusible
1.32
[ 34 ]
SEE DETAIL C
7.91
[ 201 ]
1.35
[ 34 ]
OF BOX
.27 DIA (3)
[ 7]
Figure 13
.68
[ 17 ]
6.52
[ 166 ]
A (2)
B
1.50
[ 38 ]
DE
1.50
[ 38 ]
4.34
[ 110 ]
1.71
[ 43 ]
.95
[ 24 ]
1.04
[ 26 ]
KNOCKOUT
CONDUIT
CODE
SIZE
A (Concentric) .50
.75
B (Tangential) .50
.75
1.00
Figure 14
30 Amp Heavy Duty Fusible
60 Amp General Duty Fusible
KNOCKOUT
CONDUIT
CODE
SIZE
A (Concentric) .50
.75
B (Tangential) .50
.75
1.00
26
Dimensions shown in inches and millimeters [ ].
Dimensions shown accurate to + 1/8 inch.
➀ Dimensions shown apply to heavy duty switches only.
Type 3R (Outdoor)
60 Amp Heavy Duty
Figure 15
KNOCKOUT
CODE
A (Tangential)
.50
CONDUIT
SIZE
.75
1.00
1.25
Figure 16
100 Amp General and Heavy Duty
KNOCKOUT
CODE
A (Tangential)
.75
B (Tangential) 1.00
Dimensions shown in inches and millimeters [ ].
Dimensions shown accurate to + 1/8 inch.
➀ Dimensions shown apply to heavy duty switches only.
CONDUIT
SIZE
1.00 1.25
1.50
1.25
2.00
1.50
27
Detailed Dimension Drawings
Murray Type VBII Safety Switches
Type 3R (Outdoor)
200 Amp General and Heavy Duty
Figure 17
KNOCKOUT
CODE
A (Tangential) 1.25
CONDUIT
SIZE
1.50 2.00
2.50
Figure 18
400 / 600 Amp Heavy Duty Non-Fusible
KNOCKOUT
CODE
CONDUIT
SIZE
A (Tangential) 1.50 2.00 2.50 3.00 3.50
28
Dimensions shown in inches and millimeters [ ].
Dimensions shown accurate to + 1/8 inch.
➀ Dimensions shown apply to heavy duty switches only.
Type 3R (Outdoor)
400 / 600 Amp General and Heavy Duty Fusible
14.68
[ 373 ]
26.00
[ 660 ]
2.07
[ 53 ]
Figure 19
13.44
[ 341 ]
20.50
[ 521 ]
.62
[ 16 ]
2.50
[ 64 ]
9.23
[ 234 ]
DIMENSIONS
SWITCH TYPE
.83
[ 21 ]
A
STANDARD
HEIGHT REDUCED
B
C
D
E
56.57[1437] 56.07[1424] 51.00[1295] 25.46[647] 18.77[477]
45.82[1164] 45.31[1151] 40.25[1022] 20.99[533] 12.49[317]
18.77
[ 477
E ]
51.00
C ]
[ 1295
56.57
A ]
[ 1437
56.07
B ]
[ 1424
.43 DIA (4)
[ 11 ]
25.46
D ]
[ 647
KNOCKOUT
CODE
A (Tangential)
CONDUIT
SIZE
1.50 2.00 2.50 3.00 3.50
13.24
[ 336 ]
(4)
Figure 20
800 / 1200 Amp Heavy Duty Fusible
14.68
[ 373 ]
39.50
[ 1003 ]
2.50
[ 64 ]
2.07
[ 53 ]
34.25
[ 870 ]
38.40
[ 975 ]
.83
[ 21 ]
13.44
[ 341 ]
24.02
[ 610 ]
40.45
[ 1027 ]
66.82
[ 1697 ]
61.25
[ 1556 ]
66.25
[ 1683 ]
9.24
[ 235 ]
.25
[ 6]
38.40
[ 975 ]
30.46
[ 774 ]
39 96
Dimensions shown in inches and millimeters [ ].
Dimensions shown accurate to + 1/8 inch.
13.24
[ 336 ]
No knockouts in the enclosures.
29
Detailed Dimension Drawings
Murray Type VBII Safety Switches
Type 4X (Stainless); 12 (Industrial)
30 Amp Heavy Duty Non-Fusible
Figure 21
No knockouts in the enclosures.
30 Amp Heavy Duty Fusible
No knockouts in the enclosures.
30
Dimensions shown in inches and millimeters [ ].
Dimensions shown accurate to + 1/8 inch.
Figure 22
Figure 23
Type 4X (Stainless); 12 (Industrial)
60 Amp Heavy Duty
No knockouts in the enclosures.
100 Amp Heavy Duty
Figure 24
10.46
[ 266 ]
10.43
[ 265 ]
SEE DETAIL A
8.45
[ 215 ]
3.52
[ 89 ]
4.74
[ 120 ]
.42
[ 11 ]
12.02
[ 305 ]
25.00
[ 635 ]
23.16
[ 588 ]
21.96
[ 558 ]
24.16
[ 614 ]
.27 DIA (4)
[7]
6.80
[ 173
173 ]
9.65
[ 245 ]
8.73
[ 222 ]
.35
[9]
.27 DIA
[7 ]
.95
[ 24 ]
2.04
[ 52 ]
4.25
[ 108 ]
4.25
[ 108 ]
5.34
[ 136 ]
DETAIL A
.67 DIA
[ 17 ]
8.59
[ 218 ]
No knockouts in the enclosures.
Dimensions shown in inches and millimeters [ ].
Dimensions shown accurate to + 1/8 inch.
31
Detailed Dimension Drawings
Murray Type VBII Safety Switches
Type 4X (Stainless); 12 (Industrial)
200 Amp Heavy Duty
15.39
[ 391 ]
12.58
[ 319 ]
SEE DETAIL A
10.37
[ 263 ]
5.24
[ 133 ]
7.22
[ 183 ]
.42
[ 11 ]
Figure 25
16.95
[ 431 ]
8.45
[ 215 ]
OF BOX
33.00
[ 838 ]
32.17
[ 817 ]
31.07
[ 789 ]
14.62
[ 371 ]
29.96
[ 761 ]
.44
[ 11 ]
11.86
[ 301 ]
.33 DIA (4)
[9 ]
6.75
[ 171 ]
.38 DIA
[ 10 ]
1.14
[ 29 ]
4.60
[ 117 ]
.75 DIA
[ 19 ]
DETAIL A
6.63
[ 168 ]
6.75
[ 171 ]
10.01
[ 254 ]
No knockouts in the enclosures.
400 Amp Heavy Duty Non-Fusible
24.82
[ 630 ]
.63
[ 16 ]
4.41
[ 112 ]
16.00
[ 406 ]
Figure 26
14.64
[ 372 ]
SEE DETAIL
A
13.36
[ 339 ]
26.44
[ 672 ]
9.19
[ 233 ]
18.54
[ 471 ]
24.82
[ 630 ]
47.68
[ 1211 ]
46.43
[ 1179 ]
44.14
[ 1121 ]
44.57
[ 1132 ]
13.17
[ 335 ]
1.40
[ 36 ]
9.19
[ 233 ]
No knockouts in the enclosures.
32
56 DIA
Dimensions shown in inches and millimeters [ ].
Dimensions shown accurate to + 1/8 inch.
.47
[ 12 ]
13.19
[ 335 ]
DETAIL
.56 DIA
[ 14 ]
A
1.00 DIA
[ 25 ]
E
Double Throw
C
B
A
D
CL
This mounting hole
omitted on 30-100A
Type VBII Non-Fusible
switches
(6) ”F“ Dia. mounting holes (30-200A)
(4) ”F“ Dia. mounting holes (400-1200A)
C
B
Double Throw
Dimensions - Inches
Enclosure
Catalog Number
Mounting
A
B
C
D
E
F
HDUN221, HDUN321, HDUN361, HDUN361R
HDHN321, HDHN321AW
HDUN222, HDUN322, HDUN362, HDUN362AW
HDN322, HDHN322AW
24.50
29.12
24.88
33.45
9.53
9.53
11.50
11.50
6.09
6.09
6.09
6.09
19.00
23.50
19.00
27.50
6.75
6.75
9.38
9.38
0.268
0.268
0.268
0.268
HDUN223, HDUN323, HDUN363, HDUN323AW,
HD363AW
27.62
12.18
6.09
19.36
8.00
0.268
HDHN222, HDHN323AW
36.44
12.18
6.09
28.11
8.00
0.268
HDUN224, HDUN324, HDUN224AW, HDUN324AW,
HDUN364, HDUN364AW
36.00
19.12
6.42
31.00
15.00
0.44
HDHN324
49.44
19.12
6.42
44.50
15.00
0.44
HDHN325
73.54
28.22
9.44
65.50
16.00
0.56
HDUN225, HDUN225AW, HDUN325, HDUN365,
HDUN365AW, HDUN366AW
57.7
28.22
9.44
49.75
16.00
0.56
30-600A Type 1 & 3R
33
Replacement Parts
Murray Type VBII Safety Switch
HNB623
HM6123
HBB612
HH6123
HFB612
HFB656
Ampere
Rating
Line
Base
Load
Base
Handle/Handle Guard
General Duty
Heavy Duty
Mechanism
Assembly
Lugs
30A General Duty 2- and 3-Pole Fusible and Non-fusible ➄
30 Fused, 2-Pole
30 Fused, 3-Pole
30 Non-fused
W410472A
W410473A
W410473B
–
–
–
240V Max
–
–
–
–
–
–
Fusible 2 and 3-Pole 60-600A General Duty & 30-600A Heavy Duty ➄
30 HD 240V
60 GD
60 HD 240V
100
200
400
600
800
1200
HFB21 ➁
HFB612 ➁
HFB22 ➁
HFB63 ➁
HFB64 ➁
HFB65 ➂➅
HFB66 ➂➅
HFB67A ➅➇
HFB68 ➅➇
HBB21 ➁
HBB612 ➁
HBB22 ➁
HBB63 ➁
HBB64 ➁
HBB656 ➂➅
HBB656➂➅
HBB67A ➅➇
HBB68 ➅➇
–
GH223
–
GH223
GH24
HH65678
HH65678
–
–
HH6123 ➆
–
HH6123 ➆
HH6123 ➆
HH64 ➆
HH65678 ➆
HH65678 ➆
HH65678 ➆
HH68➆
–➀
–➀
–➀
–
–
–
240V Max
HM6123 ➆
HM6123
HM6123 ➆
HM6123 ➆
HM64 ➆
HM65
HM66
HM67A
HM678
HL612 ➀
HL612 ➀
HL612 ➀
HL63 ➀
HL64 ➀
HL65678 ➃
HL65678 ➃
HL67➈
➈
Fusible 3-Pole Heavy Duty ➄
30 600V
60 600V
60A Oversized
100
200
400
600
800
1200
HFB612 ➁
HFB62 ➁
HFB623 ➁
HFB63 ➁
HFB64 ➁
HFB65 ➂➅
HFB66 ➂➅
HFB67A ➅➇
HFB68 ➅➇
600V Max
HBB612 ➁
HBB62 ➁
HBB623 ➁
HBB63 ➁
HBB64 ➁
HBB656 ➂➅
HBB656 ➂➅
HBB67A ➅➇
HBB68 ➅➇
–
–
–
–
–
–
HH65678
–
–
HH6123 ➆
HH6123 ➆
HH6123
HH6123 ➆
HH64 ➆
HH65678 ➆
HH65678 ➆
HH65678 ➆
HH68➆
HM6123 ➆
HM6123 ➆
HM6123
HM6123 ➆
HM64 ➆
HM65
HM66
HM67A
HM678
Non-Fusible 3-Pole 60-600A General Duty and 30-600A Heavy Duty ➄
30 HD
60 GD
60 HD
100
200
400
600
800
1200
34
➀
➁
➂
➃
➄
➅
HNB612 ➁
HNB612 ➁
HNB623 ➁
HNB623 ➁
HNB64 ➁
HNB65 ➂➅
HNB66 ➂➅
HNB67A ➅➇
HNB68 ➅➇
–
–
–
–
–
–
–
–
–
Three lugs included in kit.
Includes lugs.
Lugs are not included.
One lug per kit.
One per switch required unless otherwise noted.
One required per pole.
–
GH223
–
GH223
GH24
HH65678
HH65678
–
–
HH6123 ➆
–
HH6123 ➆
HH6123 ➆
HH64 ➆
HH65678 ➆
HH65678 ➆
HH65678 ➆
HH68
HL612 ➀
HL612 ➀
–
HL63 ➀
HL64 ➀
HL65678 ➃
HL65678 ➃
HL67➈
➈
600V Max
HM6123 ➆
HM6123
HM6123 ➆
HM6123 ➆
HM64 ➆
HM65
HM66
HM67A
HM678
➆ For type 4 / 4X stainless steel switches add “S” to end of catalog number.
➇ Lugs included with line and load bases.
➈ One lug kit per pole for either line or load required.
HL612 ➀
HL612 ➀
HL612 ➀
HL63 ➀
HL64 ➀
HL65678 ➃
HL65678 ➃
HL67➈
➈
Fuse Application and Selection Data
Murray Type VBII Safety Switch
Murray enclosed safety switches are
designed for fuse versatility.
Although Murray is not a manufacturer of fuses, once the type of fuse
needed for a particular application
is determined, it’s easy to select an
appropriate switch.
The proper fuse type for the
application is selected using the
following parameters:
• Voltage requirements
• Conductor ampacity
• Horsepower requirements
• Maximum available RMS
fault-current
• UL Fuse Class when specified
The compatible fusible safety
switch is selected following
these parameters:
• System voltage requirements
• Fuse amp ratings
• Available fault current
• UL Fuse Class
• Environmental conditions
• Number of poles required
One-Time Fuses
One-time fuses are standard for use
in situations calling for 1200
amperes or less with maximum
voltages for 250 or 600 volts.
Simply designed, current carrying
links are connected to contact
pieces at the ends of the enclosure.
When an overload occurs, the circuit quickly opens and the arc is
quenched by granular insulating
material that surrounds the current
carrying links.
Current Limiting Fuses
This design offers the highest
degree of circuit protection among
fuses. Inside, usually copper or
silver alloy links are imbedded in
pure quartz sand between heavy
copper end blocks. The special
design is fast acting and interrupts
during the first half cycle of a fault.
This causes a limitation of both
fault peak current and let-thru
current.
Dual-Element Time-Delay Fuses
Dual-element fuses may have timedelay designation since these fuses
employ two distinctly separate
types of elements. One provides
overload protection with time delay.
(UL states that time delay means
having a 10-second operating delay
at 500 percent of fuse label rating.)
The second provides short circuit
protection similar to a single
element fuse. Dual element fuses
are most frequently used on motor
loads.
Available in Classes J, L, R, and T.
Available in all Classes.
35
Fuse Applications and Dimensions
Murray Type VBII Safety Switch
Class R and H Fuses
Class R Application: Overcurrent and
short circuit protection of motors and
transformers, service entrance equipment, feeder and branch circuits.
(General Purpose Protection)
A
A
B
F
B
E
D
G
Class R Rejection: A UL Class R Fuse
Kit is required that rejects lower-rated
fuses (H and K).
D E
C
G
C
Blade Type 61-600A
Ferrule Type 0-60A
Class H Fuse Dimensions
250 Volts
Ampere
Rating
0-30
35-60
65-100
110-200
225-400
450-600
600 Volts
A
B
C
D
E
F
G
A
B
C
D
E
F
G
2
3
5 7/8
7 1/8
8 5/8
10 3/8
––
––
––
––
––
––
––
––
––
––
––
––
––
––
––
––
––
––
9/16
13/16
3/4
1 1/8
1 5/8
2
––
––
1/8
3/16
1/4
1/4
1/2
21/32
1
1 3/8
1 7/8
2 1/4
5
5 1/2
7 7/8
9 5/8
11 5/8
13 3/8
––
––
––
––
––
––
––
––
––
––
––
––
––
––
––
––
––
––
13/16
1 1/16
3/4
1/8
1 5/8
2
––
––
1/8
3/16
1/4
1/42
17/32
21/32
1
1 3/8
1 7/8
1/4
Class R Fuse Dimensions
250 Volts
Ampere
Rating
A
B
C
0-30
35-60
61-100
101/200
201-400
401-600
2
3
5 7/8
7 1/8
8 5/8
10 3/8
5/32
3/16
1/2
11/16
15/16
1 1/8
5/64
3/32
9/32
9/32
13/32
13/32
D
3/8
5/8
23/64
35/64
51/64
63/64
600 Volts
E
9/16
13/16
3/4
1 1/8
1 5/8
2
Class J
Application: Current limiting protection to a wide variety of applications,
Panelboards, Switchboards, Busway,
Feeder Circuits.
Rejection: Its unique dimensions prevent the substitution of another fuse.
F
G
––
––
1/8
3/16
1/4
1/4
1/2
21/32
1
1 3/8
1 7/8
2 1/4
A
B
C
D
E
F
G
5
5 1/2
7 7/8
9 5/8
11 5/8
13 3/8
3/16
1/4
1/2
11/16
15/16
1 1/8
3/32
3/32
9/32
9/32
13/32
17/32
5/8
7/8
23/64
35/64
51/64
53/64
13/16
1 1/16
3/4
1 1/8
1 5/8
2
––
––
1/8
3/16
1/4
1/4
17/32
21/32
1
1 3/8
1 7/8
2 1/4
A
C
1” MIN
B
Class J Ferrule Type 0-60A
Class J Blade Type 61-600A
Class J Fuse Dimensions
Ampere
Rating
A
B
C
D
E
0-30
31-60
61-100
101-200
201-400
401-600
2 1/4
2 3/8
4 5/8
5 3/4
7 1/8
8
1/2
5/8
3 5/8
4 3/8
5 1/4
6
13/16
1 1/16
1 1/8
1 5/8
2 1/8
2 5/8
–
–
3/4
1 1/8
1 5/8
2
–
–
1/8
3/16
1/4
3/8
36
F
–
–
1
13/8
17/8
21/8
G
–
–
1/2
11/16
15/16
1
H
–
–
9/32
9/32
13/32
17/32
J
–
–
3/8
3/8
17/32
11/16
K
–
–
2 5/8
3
3 3/8
3 3/4
Class L
Class T
Application: Current limiting
protection for service entrance
equipment, feeder circuits and
metering centers.
Application: It combines two highly
desirable features - highly current
limiting and a small physical size.
Panelboards, switchboards,
metering centers.
Rejection: Its unique dimensions
prevent the substitution of another
fuse.
Rejection: Its unique dimension
prevents the substitution of another
fuse.
8 5/8
5
103/4
21
/8
/32
5
/8
5
113/32
/16
13/8
5
/8
8
1
11/8
2 7/16
/2
3 13/16
/8
5
3
/4
/8
3
2 7/16
15
1
11/8
3 15/32
/16
/2 13/8
3 13/16
/8
3
3
2 /8
7
2 7/8
1
3 15/32
/8
/4
5 /8
3
4 5/16
Class L Blade Type 601-800A
Class L Blade Type 801-1200A
Fuse Ratings
Class
Amperes
H
1-600A
K5*
1-600A
J
1-600A
RK1
1/10-600A
600V or less
250V or less
RK5 1/10-600A
(time
delay)
T
1-1200A
600V or less
250V or less
T
1-800A
L
601-6000A
Volts
250 and 600V
or less AC
250 and 600V
or less AC
600V or less
300V AC
600V AC
600V or less
Dimensions
Int. Ratings
I2t, Ip
Circuits
NEC
standards
Class H
without rejection
Diff. from
Class H
Class H with
rejection
feature
Class H with
rejection
feature
Diff. from
Class H
Diff. from
Class H
Bolt type
10,000A
–
100,000A
Less than
10,000A available
I2t - RK5 up to 100A
Ip - RK5 up to 100A
I2t - Low
Ip - Low
I2t - Slightly>J
Ip - Slightly>J
200,000A
I2t - >RK-1
Ip - RK-1
General purpose
circuits
Feeder
circuits
Main & feeder
circuits
Main & feeder
circuits(motor load
small percent)
Motor starting
currents
200,000A
I2t - <J
Ip - <J
I2t - =J
Ip - =J
I2t - Low
Ip - Low
Main & feeder
circuits
Main & feeder
circuits
Main & feeder
circuits
200,000A
200,000A
200,000A
200,000A
* Class K5 fuses do not prohibit the use of Class H type fuses in a switch.
37
Ratings and Test Requirements
Murray Type VBII Safety Switch
Enclosed Switch Load Ratings
The primary functions of a fusible
enclosed switch are to carry current
continuously, to provide over current and short circuit protection, to
be capable of disconnecting the
circuit, and to provide means for
mounting fuses. Safety switches
may also have other capabilities
covered by load break ratings (in
contrast with no-load disconnect
switches), such as standard and
maximum horsepower ratings
and the ability to withstand the
maximum I2t energy let-throughs
of fuses.
All Murray safety switches are
capable of continuously carrying
their full-rated nameplate current
at rated voltage. This capability
is directly attainable in no-fuse
switches and in fusible switches
when the fuses are replaced with
copper bars, without exceeding
permissible temperature rise.
Fuses are capable of carrying their
rated current in open air. Under this
condition the fuses will not open
and will not exceed permissible
temperature rise. When fuses are
used in a switch or other enclosure,
a higher ambient temperature is
caused by the switch heat and
fuse-generated heat. Since fuses
are thermal acting by design, they
will not carry full current rating at
higher ambient temperatures.
To assist users of fusible equipment, UL requires each fusible
switch to carry the statement,
“Continuous Load current not to
exceed 80% of the rating of the
fuses employed.” Good electrical
practice may require even further
de-ratings, depending on the type
of fuse, load, altitude and ambient
temperature of the switch location.
38
Load Break Ratings
All Murray safety switches are load
break rated. The load break
rating is assigned by UL after the
switching unit has successfully
performed the following tests for
general use enclosed switches:
Load Break Ratings
Number of
Switch
ON/OFF
Ampere Operations
Rating per Minute
30-100
200
400
600
800
1200
6
5
4
3
2
1
Number of Operations
With
Current
Without
Current
Total
6000
6000
1000
1000
500
500
4000
2000
5000
4000
3000
2000
10000
8000
6000
5000
3500
2500
12X Current Rating
In addition to the required UL
overload testing, all Murray VBII
switches have been tested at 12
times rated current at 600V AC
to assure compliance to automotive
and other heavy industry
requirements.
Horsepower Ratings
All Murray safety switches, where
appropriate, are horsepower rated.
The assignment of such ratings is
made by UL only after the switching
unit has undergone tests to determine its acceptability. In addition,
the unit must successfully perform
on an overload test series which
includes repeated interruption of
the locked rotor current of the
motor for which it is to be rated
as follows:
Horsepower Ratings
Max. HP
Rating
100
500
Number of
ON/OFF Ops.
per Minute
6
1
Number of Cycles
of Operation
50
10
Most switches have two or more
ratings for a particular voltage and
current. Murray safety switches are
UL listed for design E horsepower
ratings. With Murray safety
switches no derating is required
in most cases. Depending on the
switch and its application, various
ratings have been achieved. All
Murray switches include a complete
list of the ratings on the inside of
the cover.
Horsepower Rating Charts
The number and variety of horsepower ratings that can be applied
to a switching unit makes it
impractical, in most instances, to
list all such ratings on the front of
the unit. Murray does, however,
provide this data by means of
a chart on the inside cover.
Horsepower Rating Range
UL test procedure includes ratings
up to 500 HP. Murray safety switch
units in appropriate sizes have successfully passed the locked rotor
current interrupting test series for
ratings through 500 horsepower at
both 480 and 600 volts AC and
through 50 horsepower at 600 volts
DC.
Maximum Horsepower Ratings
The maximum horsepower rating is
based upon the largest rating of a
time delay fuse: 1) which can be
incorporated in the switch, and 2)
which will permit the motor to be
started. Since the fuse has extra
time delay, it can hold the starting
current of a larger motor longer
than a standard fuse.
Standard Horsepower Rating
This rating is assigned to a switch
after it has successfully completed
the locked rotor test series, on the
basis of the largest standard fuse
rating: 1) which can be incorporated in the switch, and 2) which will
permit the motor to be started.
The standard fuse does not have
a designed time delay to allow for
motor starting currents.
Murray Type VBII Safety Switch
Multiple Voltage
Horsepower Ratings
A switch may have additional
standard and maximum horsepower ratings for different voltages.
A switch that is horsepower rated at
240V AC or 250V DC, may also have
horsepower ratings for motors on
120V AC or 125V DC circuits.
Multi-Pole Horsepower Ratings
A switch may have horsepower
ratings applicable to the same
current and voltage ratings but with
fewer poles, if the switch is investigated and found suitable for the
assigned rating.
Short Circuit Withstandability
UL test procedures for switches
and fuses have been expanded to
provide realistic standards of
performance with respect to
clearing high-level fault currents.
These revised standards deal with
the control of destructive energy in
the shorted circuit. Two types of
potential damage are characteristic
of high-level short circuits:
mechanical and thermal.
Mechanical damage is caused by
the electromagnetic force surrounding
conductors; thermal damage is the
result of excessive current during
the fault clearing time.
The UL fuse standard defines
maximum instantaneous peak letthrough current (lp) and maximum
destructive energy let-through (I2t)
for each fuse (except Class H).
Applications of fuses and safety
switches on systems having
over 10,000A are available. Short
circuits require selections of
the proper UL-listed fuses and
switches capable of withstanding
I2t let-throughs. See chart below
for withstand ratings on Murray
switches.
I2t Rated
Suitability tests for service with
Class H, R, J, L and T fuses have
been conducted. Representative
switches, with test fuses connected
in series with each switch, were
subjected to I2t let-through values
in excess of the capacities of the
largest fuses acceptable by the
switches.
To pass the test, the switch must
remain operable after being closed
into a high amp available short
circuit current. The test fuse
is sized so that higher levels of
let-through current and energy will
be reached than would ever occur
during normal usage in the field.
See chart below for I2t ratings
on Murray switches.
Horsepower Ratings
I2t and Ip Ratings
Fuse Rating
Fuse Class
Fusible
Plug
H
K
J
R
T
H
K
J
R
Non-Fusible ①
Short Circuit Rating
General Duty
Heavy Duty
10,000
10,000
10,000
100,000
100,000
100,000
10,000
10,000
100,000
100,000
–
10,000
10,000
200,000
200,000
200,000
10,000
10,000
200,000
200,000
Switch
Rating
Ampere
I2t Rating
(Amp2 x sec.)
Ip Rating
(Amp2 x sec.)
30
60
100
200
400
600
800
1200
50,000
200,000
500,000
2,000,000
6,000,000
12,000,000
10,000,000
12,000,000
10,000
26,000
32,000
50,000
75,000
100,000
80,000
100,000
① With fuses in series with switch. All non-fusible switches are also rated 10,000 A/C when protected by a UL listed circuit breaker.
Fuse or circuit breaker ampere rating cannot exceed switch ampere rating.
39
Murray Catalog Numbering System
Type VBII Safety Switch Catalog Numbering System
H
HN
3
6
4
A
Switch Type
J
Enclosure
G = General Duty (Single Throw)
H = Heavy Duty (Single Throw)
J
S
W
No Letter
= Type 12
= Type 4X
= Type 3R
= Type 1
Neutral and/or Protector Lock ®
Fuses
A = Filler; To preserve spacing in
case 7th position is used
C = CR-H Receptacle — 60A 4W
K = AH Receptacle — 30A 4W
L = AH Receptacle — 60A 4W
N = Insulated Groundable Neutral
HN = Factory Set for Class ‘H’ Fuse
LN = Factory Set for Class ‘L’ Fuse
P = Plug Fuse Type
UN = Unfused
DHN = Fusible (Double Throw)
DUN = Non-Fused (Double Throw)
Wires
Amperage
Number of Wires
Including Neutral 1-4
1 = 30A
2 = 60A
3 = 100A
Voltage
1 = 120V AC
2 = 240V AC
6 = 480/600V AC
NOTE: 6th & 7th positions
omitted in case of no-neutral,
Type 1.
4 = 200A
5 = 400A
6 = 600A
7 = 800A
8 = 1200A
Murray Accessories Catalog Numbering System
H
N
6
4
Brand Labeling
Switch Type
H = Heavy Duty
G = General Duty
M = Murray
Amperes
Accessory Type
A1 =
A2 =
G =
N =
R =
T =
Auxiliary Switch 1/NO and 1/NC
Auxiliary Switch 2/NO and 2/NC
Ground Lug Kit
Neutral
Class R - Fuse Clip Kit
Class T - Fuse Kit
M
Maximum Voltage
2 = 240V Max
6 = 600V Max
1
= 30A
2
= 60A
12 = 30/60A
3
= 100A
23 = 60/100A
123 = 30/60/100A
1234 = 30/60/100/200A
4
= 200A
5
= 400A
56 = 400/600A
5678 = 400/600
800/1200A
6
= 600A
78 = 800/1200A
Murray Electrical Products
Siemens Energy & Automation, Inc.
5400 Triangle Parkway
Norcross, GA 30092
For nearest sales office
1.800.241.3138
For product information
1.800.478.6346
www.murrayconnect.com
© 2007 Siemens Energy & Automation, Inc. All Rights Reserved
Murray is a registered trademark of Siemens Energy & Automation, Inc.
Specifications are subject to change without notice
Order # MYPS- MB03A-0307 15M0307CEG Printed in USA