The Fast Acting 440mA Replacement Fuse has a fast acting blow characteristic, a current rating of 440 amp, and a 1000-volt rating. The Fluke 943121 440 amp 1000-volt replacement fuse comes one item per package, and are not covered by a warranty. * Current Rating:440mA * Blow Characteristic:Fast Acting * Voltage Rating, VAC:1000V * Cartridge Fuse * 1 per Pack