Control Circuit Fusing Instructions
IMPORTANT: Select the fuse to protect the control circuit conductors in accordance with the National Electrical Code and
Canadian Electrical Code.
Primary Fuse Sizing Chart - Refer to NEC and CEC Requirements (When only Primary Protection is used.)
Maximum Ampere Rating for Current Limiting Class CC Fuses based on Transformer Primary Voltage
Transformer
VA Rating 208 V 220V 240 V 277 V 347 V 380 V 400 V 415 V 440 V 480 V 500 V 550 V 600 V 690 V
63 VA
.75
.75
.75
.5
.5
.4
.4
.4
.4
.25
.25
.25
.25
.25
80 VA
1
1
1
.75
.5
.5
.5
.5
.5
.5
.4
.4
.4
.25
130 VA
1.5
1.5
1.5 1.25
1
1
.75
.75
.75
.75
.75
.5
.5
.5
200 VA
2.5
2.5
2.5
2
1.5
1.5
1.5 1.25 1.25 1.25
1
1
1
.75
250 VA
3
3
3
2.5
2
1.5
1.5
1.5
1.5
1.5
1.5 1.25 1.25
1
350 VA
5
4
4
3
3
2.5
2.5
2.5
2
2
2
1.5
1.5
1.5
500 VA
4
3
3
5
4
3
3
3
3
3
3
2.5
2.5
2
750 VA
6
5
5
4
3
5
5
5
5
4
4
4
3
3
800 VA
6
6
5
4
3
3
3
5
5
5
4
4
4
3
1000 VA
8
7
6
6
4
4
4
4
3
3
3
5
5
4
1600 VA
12
12
11
9
7
7
6
6
6
5
5
4
4
3
2000 VA
12
11
13
12
9
8
8
8
7
6
6
6
5
4
Primary Fuse Sizing Chart - Refer to NEC Requirements Only (When Primary and Secondary Protection is used.)
Maximum Ampere Rating for Current Limiting Class CC Fuses based on Transformer Primary Voltage
Transformer
VA Rating 208 V 220V 240 V 277 V 347 V 380 V 400 V 415 V 440 V 480 V 500 V 550 V 600 V 690 V
63 VA
.75
.75
.5
.5
.4
.4
.4
.4
.3
.3
.3
.25
.25
.25
80 VA
1.5
1.5
1.5
1
1
1
1
.75
.75
.75
.75
.5
.5
.5
130 VA
3
2.5
2.5
2
1.5
1.5
1.5
1.5
1.25 1.25 1.25
1
1
.75
200 VA
4
4
4
3
2.5
2.5
2.5
2
2
2
2
1.5
1.5
1
250 VA
6
5
5
4
3
3
3
3
2.5
2.5
2.5
2
2
1.5
350 VA
8
7
7
6
5
4
4
4
3
3
3
3
2.5
2.5
500 VA
6
5
5
9
7
6
6
6
5
5
5
4
4
3
750 VA
9
8
7
6
5
9
9
9
8
7
7
6
6
5
800 VA
9
9
8
7
5
5
5
8
8
8
8
7
6
5
1000 VA
12
10
10
9
7
6
6
6
5
5
5
8
8
7
1600 VA
15
15
15
12
11
10
10
9
9
8
8
7
6
5
2000 VA
20
20
20
18
14
12
12
12
10
10
10
9
8
7
Secondary Fuse Sizing Chart - Refer to NEC and CEC Requirements
Maximum Ampere Rating for Current Limiting Midget Fuses
Transformer
VA Rating
63 VA
80 VA
130 VA
200 VA
250 VA
350 VA
500 VA
750 VA
800 VA
1000 VA
1600 VA
2000 VA
24 V
4
5
9
13
15
20
30
45
45
60
100
-----
110 V
.75
1
1.8
2.5
3.2
4.5
6.25
9
9
12
20
25
115 V
.75
1
1.8
2.5
3.2
4.5
6.25
9
9
12
20
25
120 V
.75
1
1.8
2.5
3.2
4.5
6.25
9
9
12
20
25
230 V
.4
.5
.9
1.25
1.5
2.25
3
4.5
4.5
6
10
12
ATTENTION: To prevent electrical shock, disconnect from power source before installing or servicing.
ATTENTION: Pour éviter tout risque de choc électrique, couper le courant avant l'installation ou le réglage.
TYPICAL FUSE
BLOCK CONNECTIONS
FOR TRANSFORMER
WITH DUAL VOLTAGE
PRIMARY
H1
H2
"J"
H3 H4
1-PHASE or
3-PHASE LINES
L3
L1
L2
PRI.
H1
L1
L2
Single Voltage Primary: Transformer primary is
marked H1 and H2. Wire shown connected at H1 on
dual voltage is connected at H1 on single voltage
primary. Wire shown connected at H4 on dual voltage
primary is connected at H2 on single voltage primary.
H2
1
X1
SEC.
GND.
X2
X1
T1
W H E NU S E DW I T HA
STARTER, CONNECT TO
N.C. CONTACT OF O.L. OR
TO COIL TERMINAL.
(SEE SPECIFIC WIRING
DIAGRAM INSTRUCTIONS)
H1
TYPICAL FUSE
BLOCK CONNECTIONS
FOR TRANSFORMER
WITH SINGLE VOLTAGE
PRIMARY
H2
T3
T2
NOTE:IFSECONDARY
FUSINGISNOTUSED,
CONNECT WIRES TO X1
AND X2 AND REMOVE WIRE
FROM SECONDARY FUSE
1-PHASE or
3-PHASE LINES
L3
L1
L2
GND.
Ground: If specified, ground transformer at X2.
TIGHTENING TORQUES
Fuse Block Terminals:
16-24 lb-in.
Transformer Terminals:
(1) #18-12 AWG CU Torque 12 lb-in / 1.4 N•m
or
(2) Same #18-12 AWG CU Torque 12 lb-in / 1.4 N•m
PRI.
H1
L1
Maintain this equipment in accordance with
guidelines of NFPA-70B, Electrical Equipment
Maintenance.
L2
H2
1
Dual Voltage Primary: Transformer shown has a dual
voltage primary and is connected for high voltage. For
lower voltage, remove jumper "J" and connect H1 to
H3 and H2 to H4.
X1
SEC.
X2
X1
T1
W H E NU S E DW I T HA
STARTER, CONNECT TO
N.C. CONTACT OF O.L. OR
TO COIL TERMINAL.
(SEE SPECIFIC WIRING
DIAGRAM INSTRUCTIONS)
T2
T3
NOTE: IF SECONDARY
FUSINGISNOTUSED,
CONNECT WIRES TO X1
AND X2 AND REMOVE WIRE
FROM SECONDARY FUSE
TO X1.
Fuse Block Accessory Kits for use when fuse block is not integral with the transformer.
ATTENTION: These control circuit fusing kits are intended to be used for control circuit transformer protection and
protection of control circuits capable of delivering no more than 200,000 RMS symmetrical amperes, 600
volts
maximum.
ATTENTION: Ces ensembles fusibles pour circuits de commande sont conçus pour la protection des
transformateurs de circuits de commande et des circuits de commande eux-mêmes a condition que ceux-ci ne
puissent fournir qu'un courant symétrique efficace maximal de 200,000 ampères, 600 volts.
One Pole Kit - Panel Mounted (Midget Fuse) ............................................................................... Cat. No. 1491-R165
Two Pole Kit - Panel Mounted (Midget Fuses) ......................................................................... Cat. No. 1491-R167
Three Pole Kit - Panel Mounted (Two Class CC Fuses / One Midget Fuse)............................... Cat. No. 1491-R169
Three Pole Kit - Panel Mounted (Three Class CC Fuses) ........................................................... Cat. No. 1491-R171
These kits use only Class CC or Midget fuses (rated 0.5 to 30 amperes) such as those offered by the
following manufacturers:
Bussmann KTK-R
Ferraz-Shawmut ATM R
Littelfuse KLK
IMPORTANT: For control circuit transformers with a 350 VA or larger rating, it is recommended that Bussmann Type FNQ-R,
Ferraz-Shawmut Type ATDR, Littlefuse Type KLDR time delay fuses or equivalent be used for primary fusing.
Single Pole Kit - Bulletin 500 Line Controller Mounted (Class CC Fuses) ................................. Cat. No. 599-FR04*
*Cat. No. 599-FR04 is rated for 6 ampere fuse maximum. Controller mounting applies to size 0-5
devices only.
One Pole Kit - Panel Mounted (31-60 Ampere Class J Fuse) ...................................................... Cat. No. 1491-R173
One Pole Kit - Panel Mounted (61-100 Ampere Class J Fuse) .................................................... Cat. No. 1491-R175
42052-008-01 (03)
Printed in U.S.A.
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