UL 508A Frequently Asked Questions

Q. Can Current Limiting Fuses used in a branch circuits raise the panel SCCR rating, example using type J fuses with a 5K rated contactor.

A. No, UL requirements only allow for the modification of the panel SCCR rating through the use of current limiting feeder components, see SB4.3.

Category: Application

Keywords: current limiting, fuses, branch circuits, type J , contactor