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This web page explains fuse ratings.
This web page answers the questions:
· What is a fuse rating?
· Why are fuses rated? |
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Fuse Rating |
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Home > Advice – Domestic Electrical & Central Heating > Fuse Rating |
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What Is A Fuse Rating?
A fuse rating is the current need to blow (break) the fuse.
When a fuse has blown it removes electrical power from an electrical circuit.
The fuse rating is usually on the side of the fuse.
The fuse rating is usually defined in ‘amps’ – amps are the unit of measurement of electrical current. Miles are a unit of measurement of distance, Celsius are a unit of measurement of temperature, amps are the unit of measurement of electrical current.
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Why Are Fuses Rated?
Fuses have different ratings so they can protect different electrical circuits.
Different electrical circuits use different amounts of electrical current – what may be too much electrical current for one electrical circuit may not be too much for a different electrical circuit.
A fuse that blows at, say, 10 amps is no use in an electrical circuit that uses 12 amps – the fuse would blow during normal circuit working.
A fuse that blows at 10 amps is no use in an electrical circuit that is using too much electrical current at 5 amps. The electrical circuit would be using double the ‘safe to use’ electrical current before the fuse blows.
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