Why use a fuse?

A fuse provides a safe and cost effective way to protect an electrical device or installation from electrical overloads which could damage components or wiring and potentially cause a fire. Once a fuse is blown, it must be replaced with a fuse of the same specification to ensure the circuit is properly protected.

Most fuses are fitted into fuse holders which make them simple to replace. The exception being SMD fuses and PCB mount fuses which are soldered onto printed circuit boards making them difficult to replace. A fuse holder is usually mounted in a convenient place for inspection and replacement of the fuse. Fuses can often be replaced without requiring any electrical qualifications or expertise eg. cars.

Why not use a circuit breaker instead?

1. They are generally smaller and cheaper.
2. Some applications also require very fast blow times that cannot be achieved by using a circuit breaker.
3. Circuit breakers can be sensitive to movement or vibration which could cause the switch to trip when no electrical fault exists.

What are the main fuse categories?

1. PCB Mount Fuses, Miniature Cartridge Fuses or Resettable Fuses (generally used in smaller consumer goods & applicances)
2. Automotive Fuses & Circuit Breakers (fuses designed for car, truck & marine applications)
3. Solar (PV) Fuses & Surge Protection Devices (fuses designed for Photovoltaic applications)
4. Semiconductor Fuses (very fast acting fuses designed to protect sensitive components)
5. Industrial Fuses (commonly used in commercial equipment & installations)
6. Medium & High Voltage Fuses (fuses with a voltage rating of 1000V or higher)