123075R4 SM-4 fuse refill is a 50-unit refill for SM-4 family holders (SM-4, SME-4, and SML-4) from S&C Electric Company. It is rated for 25 kV nominal (27 kV maximum) and carries a 50E continuous current rating, manufactured in the Standard Speed configuration. Packaged as 50 refill units per package, this refill is designed to replace spent fuses in outdoor distribution substations to coordinate protection for feeders, transformers, and capacitor banks within the SM-4 system.
