How do you find what amp fuse to use for electric motor.?
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You are currently browsing comments. If you would like to return to the full story, you can read the full entry here: “How do you find what amp fuse to use for electric motor.?”.
Electric motors draw a large amount of current on startup and much smaller amounts after they come up to speed. What you need is called a "slow blow fuse". Such fuses can handle up to 10 times the current they are rated to handle for a short period of time, a few seconds or less. The actual fuse rating should be specified by the manufacturer of the motor. In the absence of such a recommendation, use a fuse rated the same or slightly higher than the continuous current rating.
A properly rated circuit breaker should work in place of a fuse.
Here’s a 24V resettable circuit breaker rated for 40A. This one should be suitable, since it’s intended purpose is to operate a motor and the added startup current would have already been considered in the design.
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