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

The 832175 SMU-40 AK Fuse Unit from S&C Electric Company is a 14.4 kV nominal indoor fuse unit designed for use in SM-40 mountings with S&C metal-enclosed gear. It carries a 175E (175 A RMS) current rating and is specified for 14.4 kV nominal operation with a maximum of 17.0 kV, making it suitable for 14.4 kV-class distribution feeders and switchgear where compact, cartridge-style protection is required. This AK variant is part of the SMU-40 family used with SM-40 mountings and can accommodate S&C SMD-40 power fuses within compatible gear, enabling coordinated protection in distribution substations. Time-current characteristics for SMU-40 fuse units are published by S&C and include curves appropriate for the 175A rating (e.g., 175-2-2), supporting selective coordination with downstream devices. Catalog number 832175 therefore corresponds to a 14.4 kV/175A configuration in the SMU-40 lineup, one of several SKUs that align with the SMU-40’s modular, replaceable-fuse design. SMU-40 fuse units are designed for installation or removal from their mountings via a universal pole with S&C Large Clamp, aiding field service and quick replacement in installed gear.