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)
@600 VAC ##1 †
5 kA
10 kA
18 kA
† 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)
Rating @ 480
VAC max.
(A)
##3
Fuse class
##2
65 kA
14
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