How do you find what amp fuse to use for electric motor.?
i had a 180 watt, 8 amp motor and it blew a 30 amp fuse. i ordered a 1000 watt (at 36v) (745 watt at 25v) motor. it’s rated current is 34 amps. what rated amp fuse should i use?
o and it’s for an electric bike motor. if anyone knows: could i use a resettable breaker? if so where could i get one that can run off 24 or 36 volts dc??
thanks.
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.
http://www.marineengine.com/products/accessory.php?in=2971040