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Home » Switchgears » Electrical Fuse

Electrical Fuse

Basic FuseA fuse is used for protecting electrical devices and components from over currents and short circuits. A electrical fuse works by interrupting the flow of current through the melting of an internal element.

General specifications
Listed below are common specifications that apply to electric fuses are:
  • Fuse types: These include:
    • Miniature: These fuses are available in dimensions of 5x20mm and 6.3x32mm.

    • Subminiature or micro: Also known as micro fuses, these have very small dimensions (no principal dimension greater than 10 mm) and aresuitable for compact circuit board layouts.

    • Midget: These refer to fuses that have 13/32" diameter.

    • Automotive: These fuses are only used in automotive.

    • Blade type: These fuses are typically used in low voltage, high current applications.

    • PC board: These fuses are specifically used on PC boards.

    • Protective: These fuses are used for protecting secondary circuits or low voltage ICs.

  • Mounting: These include:
    • Solderable or surface mount
    • Solderable with leads
    • Replaceable with holder or clips

  • Performance Ratings
    There are certain performance criteria that one must consider while selecting fuses. These are:
    • Voltage rating: It is the maximum voltage, up to which a safe fault current interruption will occur.

    • Current rating: It is the maximum continuous operating current of the circuit.

    • Rated breaking capacity: It is the short circuit current at which the fuse can blow without being destructed.

    • Interrupt rating: These can be high interrupt, medium interrupt, or low interrupt.

  • Performance Characteristics
    There are certain performance characteristics that one must consider while selecting fuses. These are:
    • Fast acting: These fuses are used in circuits that have inrush currents or where the over current must be quickly interrupted.

    • Time lag: These fuses are used in circuits where high starting inrush currents occur and decay gradually.
Operating temperature of fuse is another environmental parameter that must be considered.

  • Material of construction: These include:
    • Ceramic
    • Sand
    • Glass



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