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You have a double pole breaker for 240Volt supply. The maximum current is 15 amp.
AWG 12/2 requires the use of a 20 amp single pole breaker.
can a 20 amp double pole circuit breaker be used for 2 different 120 v circuits using 14 - 2 wire
In North America the standard sizes for breakers are 15, 20, 30, and 40 amps. The 15 amp size breaker is used in general circuit wiring. The 20 amp size breaker is used for dedicated appliance receptacles, hot water tank and baseboard heating. The 30 amp size breaker is used for a clothes dryer. The 40 amp size breaker is used for the electric range.
Replacement for American Switch single pole 15 amp circuit breaker