Gfci main circuit breaker. Br ground fault self-test. Interrupt rating 10 kaic. Common trip. 2 pole, requires two 1 inch spaces. 120/240 volt. Meets federal spec classification w-c375. Gfcb main circuit breaker. Br ground fault self-test. Interrupt rating 10 kaic. Common trip. 2 pole, requires two 1 inch spaces. 120/240 volt. Meets federal spec classification w-c375.