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LRA (locked rotor amps) is not used to calculate the breaker size. Breaker's are used to protect the size of the conductor that is connected to it. Motor calculations are based on the motor's FLA (full load amps).Conductor size is 125% of the motor's FLA.

Breaker size is 250% of the motor's FLA.

This is the only occasion when the breaker is sized larger that the conductors maximum amperage rating. This is due to the motor drawing up to 300 to 600% of its FLA when starting.

If you state the motor's wattage, voltage or amperage this calculation can be calculated here.



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Q: LRA is 134 AMPS. what size breaker should be used?
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