Safety and work practicesQuestion 827 of 1506

Why do some control panels use a fuse holder with an insulating housing around the whole fuse?

  1. It makes the fuse blow at a lower current than its rating.
  2. It stores the spare fuses for the panel.
  3. It hides the live metal clips so people cannot touch them by accident.
  4. It grounds the fuse body to the panel.
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Correct answer: It hides the live metal clips so people cannot touch them by accident.

An enclosed holder reduces the chance of accidental contact with live clips, unlike an open fuse block.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 12.4: Fuses

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Questions last reviewed: 18 October 2026