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System Design
3.12 UL Coordination with Short Circuit Protection Devices
Standard Fault Short Circuit Current Ratings
Suitable for use on a circuit capable of delivering not more than the stated level of amperes
(symmetrical rms, refer ##1 in table), 600 VAC maximum.
•
Maximum fuse rating (A) – Standard fault short circuit current
Model
Nominal Rating (A)
3 cycle short cct rating
@600 VAC ##1 †
0024B
24
5 kA
0042B
42
0052B
52
10 kA
0064B
64
0069B
69
0105B
105
0115B
120
0135B
135
0184B
184
18 kA
0200B
225
0229B
229
0250B
250
0352B
352
0397B
397
0410B
410
0550B
550
30 kA
0580B
580
† Suitable for use in a circuit with the prospective current noted, when protected by any
Listed fuses or Listed circuit breakers sized according to the NEC.
High Fault Short Circuit Current Ratings
•
Maximum fuse rating (A) – High fault short circuit current
Suitable for use on a circuit capable of delivering not more than 65,000 rms symmetrical
amperes, 480 VAC maximum, when protected by fuses of the stated class and rating (refer
##2 and ##3 in table).
Model
Nominal
Rating (A)
Short Circuit
Rating @ 480
VAC max.
Listed fuse rating
(A)
##3
Fuse class
##2
0024B
24
65 kA
30
0042B
42
50
Any
0052B
52
60
(J, T, K-1,
0064B
64
80
RK1, RK5)
0069B
69
80
0105B
105
125
0115B
120
125
J, T, K-1, RK1
0135B
135
150
14