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What Is a Switch Fuse?

By David Besh on Thu 05 March 2026 in News Item

Types, Ratings & When to Use Them

A switch fuse is a load-breaking isolator combined with fuse protection. It allows safe manual isolation of a circuit while providing overcurrent and short-circuit protection via a replaceable fuse link. Most switch fuses use BS 88 or NH fuse links, offering very high fault-current protection compared to many resettable devices.

 

Typical Applications

Switch fuses are commonly used for:

  • Sub-main distribution circuits
  • Commercial heating systems
  • Distribution boards feeding multiple circuits
  • Motor and plant equipment
  • Agricultural and industrial installations
  • Three-phase supplies
  • They are particularly useful where fault levels exceed the breaking capacity of MCBs.

Key Advantages

  • High breaking capacity, suitable for demanding environments
  • Excellent discrimination with downstream protective devices
  • Clear isolation, often with lockable handles for safety procedures
  • Robust construction, ideal for long service life
  • Switch fuses are a trusted solution where safety, coordination, and reliability are critical.

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