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What is the withstand rating of the 9422 flange-mounted, variable depth disconnect switch rated 30 A through 100 A?
Issue:
9422 flange-mounted 30-100A withstand rating

Product Line:
Operating Mechanisms and Disconnect Switches

Environment:
9422 flange-mounted Variable depth disconnect switches

Resolution:
Our 9422 flange-mounted disconnect switches rated 30 A through 100 A utilize the Square D heavy duty safety switch components and have the same UL Listed maximum short circuit current ratings. These ratings are as follows:
Switch Size Fused, Used With UL Listed Short Circuit Current Rating (RMS Sym.)
30 - 100 A UL Listed Class H or K Fuses 10k
30 - 100 A UL Listed Class R or J Fuses 200k @ 480V Max. 100k @ 600V Max.
Unfused, Used With
30 - 100 A Any Brand Circuit Breaker 10k
30 - 100 A UL Listed Class H or K Fuses 10k
30 - 100 A UL Listed Class R or J 200k
30 - 100 A Square D FA Breaker 4k
30 - 100 A Square D FH Breaker 18k

Any unfused switch always has a breaker or fuse feeding it and as such, its UL Listed short circuit current rating is expressed in terms of which short circuit branch protector is being used upstream.

Schneider Electric USA

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