Miniature Push Button Circuit Breaker, 20A One miniature push button circuit breaker for operation up to 12 or 24 volts DC or 120 or 250 volts AC. Rated for20 amp operation. The device measures approximately 1-1/8" high x 1/2" wide and 1-3/4"deep. It mounts in 7/16" inch round hole. The button pops out at overload and is reset by pushing back in.