Short Circuit Current Rating Calculator ((new)) Official

SCCR is the maximum level of short-circuit current that a component or assembly can handle during a fault event. Unlike interrupting ratings (which apply specifically to fuses or breakers), SCCR applies to the entire system, including wiring and connectors.

Let’s walk through a basic example.

Yes. Replace the 3 kA power supply with a 10 kA version, or add a current-limiting fuse (e.g., Class J, 5 kA let-through) ahead of it. Using a fuse with a let-through of 3 kA or less allows the power supply’s rating to be increased per UL 508A SB. short circuit current rating calculator

Most digital calculators and manual estimation methods follow the analytical approach outlined in UL 508A Supplement SB . The process generally involves these four steps: 1. Identify Component Ratings SCCR is the maximum level of short-circuit current

Ensuring the SCCR is greater than the Available Fault Current (AFC) prevents explosions, fires, and arc flash hazards. and arc flash hazards.