S&C Electric Company 832175 SMU-40 AK Fuse Unit

The S&C Electric Company 832175 SMU-40 AK Fuse Unit is a 14.4 kV nominal indoor fuse unit rated at 175 A (E) for use in SM-40 mounting gear. It is part of the SMU-40 family, designed for indoor distribution applications and features nickel-chrome fusible elements in a solderless construction that provides nondamageable operation under transient overloads. The 832175 designation sits among SMU-40 variants with a nominal voltage range that includes 14.4 kV and a maximum potential of 17.0 kV, making it suitable for higher‑voltage coordination within suitable SM-40 installations. Time‑Current Characteristic (TCC) data for SMU‑40 fuse units are published by S&C and cover standard‑speed and slow‑speed curves, aiding engineers in selecting the correct unit for 4.8–25 kV service conditions. This AK variant is specifically documented under the SMU‑40 catalog and specification materials, including Specification Bulletin 631‑31, which lists 832175 among the 14.4 kV/175 A options suitable for indoor SM‑40 gear.