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How fuses are rated?

Updated: 9/17/2019
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βˆ™ 13y ago

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Fuses are rated by amperage (current) and voltage. The larger the current need, the larger the rating of the fuse, to handle the current. The voltage rating of a fuse defines the maximum value of circuit voltage in which the fuse can be safely used. A fuse should not be used in a circuit with a voltage exceeding the voltage rating of the fuse.

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Q: How fuses are rated?
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Can you use a MDL for MDA fuse?

Depends on the voltage across the fuse. For fuses rated below 9 amps, the two types are almost identical (MDL has slightly lower AC Interrupting amperages), and both are rated for use up to 250V. For fuses rated above 9 amps, the MDL fuses are rated for use up to 32V, while the MDA fuses are rated for use up to 250V. More info on Cooper Bussmann (link below).


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How do you know the correct wattage of fuses?

Fuses are rated in amps not watts. You just replace the fuse with one of the exact same amp rating as the one that blew. The fuse is protecting the wiring which you normally cannot change. For that reason you must use the correct rated fuse.


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Constant temperature change due to fluctuating current/amperage draws weaken the metal inside fuses over time rendering the fuse unable to handle the rated load


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MDL vs ADL fuses?

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What is a short blow fuse?

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