The Mersen 660VFA6X320.250 is an indoor, low voltage, Class-L fuse. It has a NEMA rated voltage of up to 600 volts, an interrupting rating of up to 200kA at 600 Volts AC, and an Amp rating of 250 amps. It features a ferrule terminal for connection and is UL and cUL listed. This fuse is suitable for supplementary protection, fast-acting and overcurrent protection.