S&C Electric Company 122150R4 Power Fuse Refill Unit

The S&C Electric Company 122150R4 Power Fuse Refill Unit is an SM-4 refill module designed for use in SM-4 and SML-4 fuse holders, allowing replacement of spent fuse elements in 14.4 kV distribution gear. It is rated for 14.4 kV nominal service with a 100 A (100E) current rating, enabling safe, modular maintenance without replacing the entire fuse assembly. This refill unit is part of S&C's SM-4 power fuse family and is intended to restore protective capability by reconstituting the fuse inside the holder, with compatibility confirmed for SM-4 and SML-4 configurations. See S&C Specification Bulletins (631-31, SM-4 Refill Units) for exact interchangeability within the 122150R4 family and related part numbers (e.g., 121150R4, 251150R4, 122150R4, 252150R4).