What size circuit breaker is needed for a 12v 180w dc motor to avoid start up current nuisance trip?

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  • Anonymous
    1 month ago

    My guess:  25-30 amps 

    Make sure the wiring can handle the current.

  • elhigh
    Lv 7
    1 month ago

    20A ought to do it but consider 25A.  You didn't specify what kind of load the motor is trying to start, if it's heavy the overamp condition may be drawn out and you would need the higher rating.

  • 1 month ago

    12 volts at 180 watts equals 15 amps. Go larger and you risk overheated wiring. 

  • Anonymous
    1 month ago

    30 amp breaker, Start up current could come close to that but that size breaker should be fine.

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  • 1 month ago

    At least 20A. That would be 125% of the load. If it still trips go to 150% or 25A. It depends on the motor you are using as to what percentage of the load you can increase the fuse size to. The motor should have overloads in it to protect the actual motor. The fuse size you are asking about is for protection of the circuit conductor.

  • Anonymous
    1 month ago

    well, if you understood electricity you'd know that 180 watts at 12 volts is 15 amps. So I would probably use a 20 amp fuse. if the startup wattage is more than 180 watts, then you'll need maybe a 25-30 amp fuse. Make sure that the wiring is thick enough to handle the current also.

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