Fluke Corporation is the world leader in the manufacture, distribution and service of electronic test tools and software. Since its founding in 1948, Fluke has helped define and grow a unique technology market, providing testing and troubleshooting capabilities that have grown to mission critical status in manufacturing and service industries. From industrial electronic installation, maintenance and service, to precision measurement and quality control, Fluke tools help keep business and industry around the globe up and running. As electrical systems grow more and more complex, spikes, transients, surges, and sudden over voltage events become more common. These can trigger a sequence of events that may lead to serious injury. This is why test equipment must be designed to protect people who work in this high-voltage high-current environment. Fluke digital multimeters have been designed to meet the new IEC-1010 standards. More importantly, they have been approved by CSA as actually making these standards, which means they are designed to protect you against transients in three-phase distribution systems. Now you can stock up on Fluke 943121 440 amp 1000-volt replacement fuses for Fluke digital multimeters. This cartridge fuse has a fast acting blow characteristic, a current rating of 440 milliamp, and a 1000-volt rating. The Fluke 943121 440 milliamp 1000-volt replacement fuse comes one item per package, and are not covered by a warranty.