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Fuses

What are Fuses?

Fuses have a thick metal strip through which current passes into a circuit. If too much current starts to flow, the metal melts and cuts off the current. Fuses may be one of several types:

  • Plug and Type S fuses have a metal strip (visible through a window) that melts when there's an overload.
  • Time-delay fuses have a spring-loaded strip that allows temporary overloads.
  • Cartridge fuses show no sign of overload. They must be tested to reveal whether they've blown.

Fuse Safety Tips

  • When a fuse blows, always replace it with one of the same type and amperage rating. Never replace it with one rated higher.
  • When you need to change a blown fuse, shut off all power before touching the fuse and be sure you're standing on dry ground.
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