‘R’ Rated Motor Fuses
2.75kV, 5.5kV & 8.3kV ‘R’ Rated Motor Fuses
MVR
‘R’ Rated Motor Fuses
‘R’ Rated Motor Fuses
MVR fuses are current and energy limiting fuses intended for the
backup protection of medium voltage motor control. They are nonventing.
MVR fuses have integral striker/indicators and have standardized
dimensions compatible with today’s 5.5kV motor control gear. They
are fully interchangeable with other manufacturers’ fuses of the
same type and rating.
They feature a ‘field toughened’ element design which makes them
less susceptible to mechanical damage during shipping and installation while also providing superior cycling characteristics.
Features
• Integral indicating pin
• Standard “R” Ratings
• Toughened element design
• Fully plated parts
MVR Series General Specifications
Series
Vac
MVR2
2.75kV
MVR5
5.5kV
MVR8
8.3kV
I.R
Clip Diam
Clip centers
Ratings
Options
7” (178mm)
50kA rms symm
3”
12” (305mm)
25A, 30A, 2R,
3R, 4R, 5R, 6R,
9R, 12R, 18R,
24R, 36R
B,Y,S,X,1B,1iB
12” (305mm)
B,Y,S
B,Y,S
Options
Standard fuses are clip-in design with 3” diameter barrels (18R - 36R are double barrel designs) and have an integral striker/indicator pin. Several options are available to make them compatible with other manufacturers’ specialized designs. Add suffixes
to the part number as required. More than one option can be specified.
All options are not available in some voltages.
1B
GE 1B-Bolt-in
Standard
Hook-eye
Bolt-in
Extended
1iB
GE 1iB-bolt-in
Inverted
MVR
‘R’ Rated Motor Fuses
HV Accessories
600 Amp clip for 3” diameter barrels
p/n. FC3R
Steel backup spring for high pressure contact.
Compatible with any 3” diameter fuse.
Hookeye Add on
p/n. Hookeye
Hookeye kit is compatible with any 3” diameter fuse. May be
ordered separately.
Epoxy Resin Insulators
p/n. refer to Fusetek
We carry a range of epoxy resin insulators from 7.2kV to
38kV. Tapped brass inserts can accomodate a wide range of
equipment.
Medium voltage LED line Indicators
p/n. KF22-12
Bolt these line indicators onto any convenient live part and
the high brightness LED cluster will flash to indicate presence of voltage.
Rated for 2.5kV - 38kV
Medium Voltage Microswitch
p/n. 3100110
Need more than visual indication? Our remote mount microswitch is good for all systems up to 38kV. The insulated
Bowden cable is actuated by the fuse striker which then
actuates the microswitch at the other end.
Medium voltage bases
Fusetek can supply single or 3 pole bases for most of the
medium voltage fuses we supply.
p/n. refer to Fusetek
MVR
‘R’ Rated Motor Fuses
8.3kV Total Clearing Time Current Characteristics
100
2R
3R
4R
5R
6R
9R
12R
18R
24R
36R
Time in Seconds
10
1
0.1
0.01
100
1000
10000
RMS Amperes
100000
MVR
‘R’ Rated Motor Fuses
Part Number System
MV
R
5
/ 09R
- DI
XYS
MV
Series
5
09R
DI
Medium Voltage
R Motor Fuse
Voltage Class
Rating
Body Size
2 = 2.75kV
25A, 30A
2R, 3R
4R, 5R
6R, 9R
12R, 18R
24R, 36R
5 = 5.5kV
8 = 8.3kV
D = Single 3”
DD = Double 3”
XYS
Option Modifier
I = Striker (standard)
X = 2” extension
B = Bolt-in
S = Div. 1, class ll
Y = Hookeye
1B = GE Tags
1iB = GE inverted tags
Installation Notes:
R Rating Defined
1. When replacing ‘R’ fuses, always replace with the
same ‘R’ rating to maintain coordination and motor
starting capability.
The ‘R’ rating of a fuse is established by dividing the 20-35s melt current of the fuse by 100.
2. These fuses can replace any manufacturers’ fuse of
same ‘R’ rating.
Fuses of the same ‘R’ rating will have the same time current characteristics and ensure identical motor starting performance and coordination
with the overload relays.
3. Ensure that fuse clips have good tension. (if you can
spin the fuse in the clips easily, clips should be
replaced.)
4. Clean all contact surfaces before installation.
5. Install with striker pin facing up.
6. Unless the cause of fuse failure is known to have been confined to 1 phase, fuses should be replaced in sets of 3
to ensure ‘As new’ performance.
Technical data presented.
Amp Rating
Each fuse has both an assigned ‘R’ and amp rating. It is the ‘R’ rating of the fuse that governs the motor starting capability and coordination with the overload relays. To maintain the same capabilities, fuses should be replaced with matching ‘R’ ratings.
On direct across the line starts, the necessity of passing the motor starting current results in a fuse selection with an
assigned amp rating well above the nominal motor full load amps.
9R
200A
However, applications using reduced voltage starts, variable frequency drives or other methods to reduce the motor starting current, can result in a fuse
rating with an amp rating too close to the motor F.L.A. As a check, the fuse’s assigned full load amp rating should be a minimum of 140% of the nominal
full load amps of the motor.
MVR
‘R’ Rated Motor Fuses
Peak Let-thru Characteristics
Use these characteristics to evaluate busbar bracing requirements and withstand capability of down-the-line components.
Read RMS fault value on lower scale and read up to where it intersects the line for the fuse you are evaluating. From this intersection point, read across to the left hand scale to obtain the peak current let-thru. Note: this value is in peak asymmetrical amperes.
To convert to RMS symmetrical, divide by 2.3. Peak let-thru graph is valid for all voltage classes.
100
90
80
70
60
Time current Characteristic curves.
24R (450A)
50
18R (390A)
12R (230A)
40
30
9R (200A)
6R (170A)
5R (150A)
4R (130A)
3R (100A)
Time current curves shown on pages 4-6 are minimum melting curves. For total clearing,
please refer to the curves on pages 7-9.
Characteristic curves are generated with the fuse at an ambient
temperature of 24-26 C. Ambient temperatures higher than 30 C may
o
o
require fuse de-rating. Please contact Fusetek in this instance.
Peak Let-Thru - Assymmetrical Amperes X 1000
20
10
9
8
7
6
2R (700A)
25A/30A
5
4
3
2
1
.9
.8
.7
.6
.5
.4
.3
.2
1
.09
.08
.07
.06
.05
.04
.03
20000
40000
30000
60000
70000
80000
90000
100000
RMS Symmetrical Amperes
50000
2000
3000
4000
5000
6000
7000
8000
9000
10000
40 50 60 70
200
30
500
600
700
800
900
1000
20
300
5 6 7 8 9 10
400
.01
80
90
100
.02
Motor Application Tables.
o
Standard duty is defined as: 2 evenly spaced starts per hour, 25 C ambient temperature, 10 second run-up time and
a starting current of no more than 6X the nominal full load amp of the motor.
If any of these parameters are exceeded - use the heavy duty (HD) column.
The graphic on the right is a screen shot from our free
Fusesoft 5.0 fuse selection software and shows the ideal
coordination between the fuse, overload relay and motor
starting current. The motor starting tables were generated
using this software. Fusesoft 5.0 can be downloaded at no
charge by visiting www.fusetek.com
•
Select the appropriate HP rating in the left column
•
Read across to the appropriate voltage and duty
column (Std or HD)
•
Use the ‘R’ rating of fuse specified
•
5.5kV fuses may be used on 2.3kV control.
MVR
‘R’ Rated Motor Fuses
Total Clearing time current characteristics
5.5kV Total Clearing Time Current Characteristics
5.5kV Total Clearing Time Current Characteristic
100
30A
2R
3R
4R
5R
6R
9R
12R
18R
24R
36R
Time in Seconds
10
1
0.1
0.01
100
1000
10000
RMS Amperes
100000
MVR
‘R’ Rated Motor Fuses
Total Clearing time current characteristics
These time current curves have been plotted to maximum test points so any variations should be negative. Curves
are based on tests at an ambient of 25 C with fuses starting from cold with no initial load.
o
2.75kV
ClearingTime
TimeCurrent
CurrentCharacteristics
Characteristic
2.75kV Total
Total Clearing
100
25A
2R
3R
4R
5R
6R
9R
12R
18R
24R
Time in Seconds
10
1
0.1
0.01
100
10000
1000
RMS Amperes
100000
MVR
‘R’ Rated Motor Fuses
2.75kV Motor Fuses - 7” clip center
2.75kV Minimum Melt Time Current Characteristics
General Specifications
100
25A
2R
3R
4R
5R
6R
9R
12R
18R
24R
Time in seconds
10
1
Part
Number
A
F.L.A.
DxL
(inches)
MVR2/025A-DI
25A
25A
3
10.8
MVR2/02R-DI
2R
70
3
10.8
MVR2/03R-DI
3R
100
3
10.8
MVR2/04R-DI
4R
130
3
10.8
MVR2/05R-DI
5R
150
3
10.8
MVR2/06R-DI
6R
170
3
10.8
MVR2/09R-DI
9R
200
3
10.8
MVR2/12R-DI
12R
230
3
10.8
MVR2/18R-DDI
18R
390
2X3
10.8
MVR2/24R-DDI
24R
450
2X3
10.8
3”
76.2mm
10.88”
276.35mm
.63” max
16mm
3”
76.2mm
.63” max
16mm
3”
76.2mm
I.R
kA
Avail.
Options
50kA
rms
B,Y,S
D
0.1
3”
76.2mm
10.88”
276.35mm
DD
0.01
100
1000
10000
6.31”
160mm
100000
RMS Amperes
2.75kV Peak Current Let-through
100
90
80
70
60
50
40
24R
18R
9R/12R
6R
5R
4R
3R
2R
30
20
10
9
8
7
6
5
4
3
25A
2
1
.9
.8
.7
.6
.5
.4
.3
30000
40000
50000
60000
70000
80000
90000
100000
20000
4000
5000
6000
7000
8000
9000
10000
3000
2000
200
300
400
500
600
700
800
900
1000
.2
100
Peak instantaneous Let Through current in Kilo Amperes
2.75 kVPeak Current Let-through
Available Current in Amperes
Fuse selection for Motors rated at 2.75kV or less
Motor HP
Fuse ‘R’ rating
Standard Duty
Heavy Duty
100
2R
2R
150
3R
3R
200
4R
5R
250
4R
5R
300
5R
6R
350
6R
6R
400
9R
9R
450
9R
9R
500
9R
12R
600
12R
12R
700
12R
18R
800
18R
18R
900
18R
18R
1000
18R
24R
1250
24R
24R
MVR
‘R’ Rated Motor Fuses
5.5kV Motor Fuses - 12” clip center
5.5kV Minimum Melt Time Current Characteristics
100
30A
2R
3R
4R
5R
6R
9R
12R
18R
24R
36R
Time in seconds
10
1
General Specifications
Part
Number
A
F.L.A.
DxL
(inches)
MVR5/030A-DI
30A
30A
3
15.8
MVR5/02R-DI
2R
70
3
15.8
MVR5/03R-DI
3R
100
3
15.8
MVR5/04R-DI
4R
130
3
15.8
MVR5/05R-DI
5R
150
3
15.8
MVR5/06R-DI
6R
170
3
15.8
MVR5/09R-DI
9R
200
3
15.8
MVR5/12R-DI
12R
230
3
15.8
MVR5/18R-DDI
18R
390
2X3
15.8
MVR5/24R-DDI
24R
450
2X3
15.8
MVR5/36R-DDI
36R
650
2X3
15.8
3”
76.2mm
0.1
15.88”
403mm
I.R
kA
Avail.
Options
50kA
rms
B.Y.S,X
.63” max
16mm
3”
76.2mm
.63” max
16mm
3”
76.2mm
D
3”
76.2mm
15.88”
403mm
DD
0.01
100
10000
1000
6.31”
160mm
100000
RMS Amperes
Fuse selection for Motors rated at 5.5kV or less
2.75kV Peak Current Let-through
100
90
80
70
60
50
40
36R
24R
18R
9R/12R
6R
5R
4R
3R
2R
30
20
10
9
8
7
6
5
4
3
30A
2
1
.9
.8
.7
.6
.5
.4
.3
30000
40000
50000
60000
70000
80000
90000
100000
20000
4000
5000
6000
7000
8000
9000
10000
3000
2000
200
300
400
500
600
700
800
900
1000
.2
100
Peak instantaneous Let Through current in Kilo Amperes
5.5 kV Peak Current Let-through
Available Current in Amperes
Motor HP
100
Fuse ‘R’ rating
Standard Duty
Heavy Duty
30A
30A
150
2R
2R
200
2R
2R
250
3R
3R
300
3R
3R
350
3R
4R
400
4R
5R
450
4R
5R
500
5R
6R
600
5R
6R
700
6R
9R
800
9R
9R
900
9R
12R
1000
9R
12R
1250
12R
18R
1500
18R
18R
MVR
‘R’ Rated Motor Fuses
8.3kV Motor Fuses - 12” clip center
8.3kV Minimum Melt Time Current Characteristics
100
2R
3R
4R
5R
6R
9R
12R
18R
24R
36R
1
0.1
Part
Number
A
F.L.A.
DxL
(inches)
MVR8/02R-DI
2R
70
3
15.8
MVR8/03R-DI
3R
100
3
15.8
MVR8/04R-DI
4R
130
3
15.8
MVR8/05R-DI
5R
150
3
15.8
MVR8/06R-DI
6R
170
3
15.8
MVR8/09R-DI
9R
200
3
15.8
MVR8/12R-DI
12R
230
3
15.8
MVR8/18R-DDI
18R
390
2X3
15.8
MVR8/24R-DDI
24R
450
2X3
15.8
MVR8/36R-DDI
36R
650
2X3
15.8
3”
76.2mm
15.88”
403mm
I.R
kA
Avail.
Options
50kA
rms
B.Y.S
.63” max
16mm
3”
76.2mm
.63” max
16mm
3”
76.2mm
D
0.01
100
1000
10000
100000
3”
76.2mm
15.88”
403mm
DD
RMS AMPERES
6.31”
160mm
8.3kV Peak Current Let-through
8.3 kVPeak Current Let-through
100
90
80
70
60
50
40
36R
24R
18R
9R/12R
6R
5R
4R
3R
2R
30
Fuse selection for Motors rated at 8.3kV or less
Motor HP
Fuse ‘R’ rating
Standard Duty
Heavy Duty
250
2R
2R
300
2R
2R
350
2R
2R
400
2R
3R
450
3R
3R
500
3R
4R
600
3R
4R
700
4R
5R
.3
800
4R
5R
.2
900
5R
6R
1000
5R
6R
1250
6R
9R
1500
9R
12R
20
10
9
8
7
6
5
4
3
2
30000
40000
50000
60000
70000
80000
90000
100000
20000
4000
5000
6000
7000
8000
9000
10000
3000
2000
200
300
400
500
600
700
800
900
1000
1
.9
.8
.7
.6
.5
.4
100
Peak instantaneous Let Through current in Kilo Amperes
Time in seconds
10
General Specifications
Available Current in Amperes
Dimensions - Standard
15.88”
403mm
3”
76.2mm
.63” max
16mm
3”
76.2mm
.63” max
16mm
3”
76.2mm
D
15.88”
403mm
3”
76.2mm
DD
6.31”
160mm
Dimensions - ‘B’ bolt-in
3”
76.2mm
15.88”
403mm
.44” X .91” Slots
(1.53” c.t.c.)
.63” max
16mm
3”
76.2mm
3.6”
91.4mm
3”
76.2mm
.63” max
16mm
3”
76.2mm
7.6”
193mm
17.8”
457mm
Front view
19.3”
490mm
Dimensions - GE Tags
Dimensions for GE tags are dictated by the GE starters they fit into.
Other Medium Voltage Products
- ‘E’ Rated Distribution Fuse to 28.8kV
- DIN Distribution Fuses to 38kV
- Load Break Switches to 38kV
- Capacitor Fuses
- Adapter Kits & Live Parts
- Remote Indicator Kits
- Clips & Insulators
- PT Fuses to 38kV
pub: MVR09-1
Printed in Canada
Head Office
599 Norris Court
Kingston, On. K7P2R9
Toll Free T: 800-479-3875
Toll free F: 800-866-7690
Intl T: 613-384-4144
Intl F: 613-384-0167
E: info@fusetek.com
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