SM-4 refill unit 252060R4 from S&C Electric Company is a replacement fuse element for SM-4 family holders (SM-4, SME-4, and SML-4) used in outdoor distribution substations. This TCC 119-4 refill is rated 40E (40 A RMS) and specified for a 14.4 kV nominal service with a 17.0 kV maximum, aligning with 14.4 kV class system applications. The refill is designed to restore protective capacity after a fuse operation without replacing the entire holder, enabling quick reclosure of the protection scheme.
