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When an electrical short occurs while making a current measurement, the user relies upon the high-energy fuse in the test tool for protection. This 440 mA, 1000 V fuse is designed to keep the energy generated within the fuse enclosure, protecting the user from electric shock and burns. This fuse limits the length of time energy is applied and the amount of oxygen available for combustion.
The Fluke 440 mA 1000 V high-energy fuse is sand-filled which helps absorb the shock energy created by the current overload. It also controls the potential high temperatures generated (up to 10,000 °F). The energy created from an electrical short will melt the sand, turning it to glass. This helps smother a potential fireball by quickly cutting off the available oxygen, further protecting the user.
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