Fuse (electrical) - Packages and Materials - Special Features

Special Features

Glass cartridge and plug fuses allow direct inspection of the fusible element. Other fuses have other indication methods including:

  • Indicating pin or striker pin — extends out of the fuse cap when the element is blown.
  • Indicating disc — a coloured disc (flush mounted in the end cap of the fuse) falls out when the element is blown.
  • Element window — a small window built into the fuse body to provide visual indication of a blown element.
  • External trip indicator — similar function to striker pin, but can be externally attached (using clips) to a compatible fuse.

Some fuses allow a special purpose micro switch or relay unit to be fixed to the fuse body. When the fuse element blows, the indicating pin extends to activate the micro switch or relay, which, in turn, triggers an event.

Some fuses for medium-voltage applications use two separate barrels and two fuse elements in parallel.

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