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What Is A Fuse

This web page explains what a fuse is, why a fuse blows and lists the characteristics (parameters) of a fuse.


What Is A Fuse?

A fuse is an electrical safety device (a component) that removes electrical current from an electrical circuit when the current in the electrical circuit is too high.


‘Electrical circuit’ means anything that uses electricity, for instance an iron, a kettle or a TV.


A fuse is a length of wire that melts (breaks or blows) when the current through it is above a certain level – the fuse rating. The 'fuse rating' is the electrical current that will blow the fuse, for instance 3 amps, 10 amps or 13 amps.



A fuse is a current sensitive piece of wire – when the fuse is working the wire is not broken, when the fuse has ‘blown’ the wire breaks.


Fuse blown - explanation


Why Does A Fuse Blow?

A fuse blows because the electrical current through the fuse is too high.


The high electrical current through the fuse melts the wire inside the fuse.


High electrical current is unsafe – the fuse blows and removes all electrical current.


The usual cause of high current is a faulty electrical appliance, for instance a kettle or toaster.


A fuse has a rating, say 5 amps or 13 amps; if the electrical current goes above the fuse rating, the fuse blows.


Fuse current rating blowing a fuse explanation



Characteristics (Parameters) Of A Fuse

A fuse can be characterised by the following parameters:


Judge Electrical Limited
15 Mulberry Court, Huntington, York, YO32 9TU
Telephone 01904 764845 (Landline), 07919 033113 Mobile)
Email info@judgeelectrical.co.uk
VAT No. 852917405. Company Number 6359328