S&C Electric Company 123200R4 SM-4 Fuse Refill

The S&C Electric 123200R4 SM-4 Fuse Refill provides a field-replaceable fuse element for SM-4 outdoor power fuse equipment, enabling rapid restoration of protection without replacing the entire holder. Designed for use in SM-4 and SME-4Z holders, this refill unit is compatible with S&C’s SM-4 family of power fuses and pairs with related refills to support coordinated protection in outdoor distribution networks. The 123200R4 model carries a nominal voltage rating of 34.5 kV with a maximum of 38 kV, aligning with S&C’s specification for high‑voltage refills used in outdoor substations protecting transformers, capacitor banks, and feeders. Manufactured by S&C Electric Company, this refill unit is an official component for SM-4 systems, enabling economical and quick maintenance in utility distribution applications.