A circuit breaker 240V is also known as a double-pole circuit breaker. It is mainly used to protect a dedicated circuit for high-power appliances such as electric ranges, air conditioners, and more. This breaker is rated chiefly from 20 to 60 amps. Since a 240V breaker is as big as two 120v breakers, it takes up two places in a load center.
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To know what breaker size is best for your 240V circuit, you should first compute your device’s total amp rating. Moreover, it would be best if you also considered the 80% electrical rule. For the computation, identify the total wattage of your device, then divide it by its voltage rating.
Since your 100 amp, 240 volt service consists of 100 amp, 120 volt branches, you can have 100 amps of load on each of the two branches. Note that the AC has two 120 volt breakers with the handles connected together. That uses both of the 120 volt branches to make a 30 amp, 240 volt breaker.
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