FuseSizing is an application designed to quickly calculate the fuse ampere rating for optimal branch circuit protection. The program returns with the recommended fuse sizes for most circuits, including: Main service feeders, feeder circuit with no-motor loads, feeder circuit with all motor loads, feeder circuit with mixed loads, branch circuits with no motor loads, motor branch circuit with overload relays, motor branch circuit with fuse protection only, power factor correction capacitors, transformer fuses.