Surely the power dissipated in the fuse = I*I*R. That's not voltage dependant.Hi,
Many fuses are rated to blow at the stated value after some time interval. The rating is a bit unrealistic is you want a fuse to pop immediately at the stated current. Most want to see 115% of the rated current befre they blow immediately. A circuit breaker will perform better that way.
Part of your problem is the lower voltage. Fuses fail when they are heated to the melting point by the power dissipated in the element. Power is the product of the voltage times the amperage. Your 4 amp 240 volt fuse will carry more current at 24 volts, as it does not get as hot.
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