UL 508A Frequently Asked Questions

Q. Can current limiting fuses be used on a branch before the starter to increase the SCCR rating on that branch. Example contactor rated at 5kair with fuse of CC 100kA.

A. No, UL508A only allows current limiting devices in the feeder circuit to reduce the available short circuit current available, see SB4.3.

Category: Application

Keywords: current limiting, fuses, starter