The Magnum 400 Amp Fuse Block Kit (ME-400F) is designed to provide code-compliant over-current protection. It is used to protect the battery bank, inverter, and cables from damage caused by short circuits and overloads. It uses a fast-acting, current-limiting fuse cartridge which provides instantaneous protection in the event of a short circuit, but also employs a time delay to allow momentary current surges common in inverter applications. A rugged injection molded polycarbonate base and thermoformed ABS cover provide durability, easy installation, and good looks all in a compact, cost-effective package.