The S&C Electric Company 131600R4 SM-5 Refill Unit Power Fuse is a replacement cartridge intended for SM-5 power fuse assemblies. This refill unit serves as the removable fuse element within an SM-5 installation, allowing quick part replacement without swapping the entire fuse holder. In product listings, it is identified as 131600R4 and described as an SM-5 refill unit power fuse with the 400E designation.
