I N S TA L L AT I O N , O P ER AT I O N S A N D M A I N T EN A N C E M A N UA L
45
Maximum Fuse and Short-Circuit Rating
Size 5 – 300:15 CT (Standard and Ambient Comp.)
Size 1 (Standard and Ambient Comp.)
Size 2 (Standard and Ambient Comp.)
NEMA
Size
Class RK Fuse
Class J Fuse
Class K-1, K-5 Fuse
Max.
Clip
Max.
RMS
Sym.
Amps
Max.
Clip
Max.
RMS
Sym.
Amps
Max.
Clip
Max. RMS
Sym.
Amps
1
30A 100,000
60A 100,000
Fuse per
Overload
Heater
Table
5,000
2
60 100,000
100 100,000
5,000
3
100 100,000
200 100,000
5,000
4
200 100,000
400 100,000
10,000
5
400 100,000
600 100,000
10,000
Motor Full-
Load Amps
3-Ph, 3 Heater
Heater
Number
CR123
Maximum
Fuse
Rating
.41-.45
C054A
3
.46-.49
C060A
3
.50-.53
C066A
3
.54-.59
C071A
3
.60-.65
C078A
3
.66-.76
C087A
3
.77-.84
C097A
3
.85-.93
C109A
3
.94-1.04
C118A
3
1.05-1.15
C131A
3
1.16-1.27
C148A
3
1.28-1.39
C163A
3
1.40-1.55
C184A
6
1.56-1.73
C196A
6
1.74-1.89
C220A
6
1.90-2.05
C239A
6
2.06-2.28
C268A
6
2.29-2.47
C301A
6
2.48-2.79
C326A
10
2.80-3.31
C356A
10
3.32-3.70
C379A
12
3.71-4.06
C419A
15
4.07-4.47
C466A
15
4.48-4.95
C526A
15
4.96-5.49
C592A
20
5.50-5.91
C630A
20
5.92-6.47
C695A
25
6.48-7.20
C778A
25
7.21-8.22
C867A
30
8.23-8.72
C955A
30
8.73-9.67
C104B
35¹
9.68-10.4
C113B
35¹
10.5-11.0
C125B
40¹
11.1-12.4
C137B
45¹
12.5-13.2
C151B
50¹
13.3-15.4
C163B
60¹
15.5-17.1
C180B
60¹
17.2-18.0
C198B
60¹
Motor Full- Load
Amps 3-Ph,
3 Heater
Heater Number
CR123
Maximum Fuse
Rating
17.2-18.1
C198B
60¹
18.2-20.0
C214B
60¹
20.1-21.5
C228B
60¹
21.6-22.5
C250B
60¹
22.6-23.9
C273B
60¹
24.0-26.3
C303B
60¹
26.4-27.0
C330B
60¹
Motor Full- Load
Amps 3-Ph,
3 Heater
Heater Number
CR123
Maximum Fuse
Rating
5.48-5.85
C630A
20
5.86-6.47
C695A
20
6.48-7.35
C778A
25
7.36-8.06
C867A
30
8.07-9.03
C955A
30
9.04-9.61
C104B
35
9.62-10.5
C113B
35
10.6-11.6
C125B
40
11.7-12.5
C137B
45
12.6-13.6
C151B
50
13.7-16.7
C163B
60
16.8-17.9
C180B
60
18.0-18.7
C198B
70¹
18.8-20.4
C214B
80¹
20.5-22.7
C228B
80¹
22.8-24.7
C250B
90¹
24.8-26.3
C273B
90¹
26.4-29.5
C303B
100¹
29.6-32.5
C330B
100¹
32.6-36.7
C366B
100¹
36.8-41.9
C400B
100¹
42.0-43.2
C440B
100¹
43.3-45.0
C460B
100¹