ADM3 series moulded case circuit breaker (hereinafter referred to as circuit breaker) is a new circuit breaker product, with a new industrial appearance design, the product shows the fashionable, atmospheric sense of quality; product specifications can be covered from 125A to 800A case frame current; compact product volume, as well as the detachable design of the cover brings accessories independent installation function, greatly improving the convenience of the product; the product has a small size, high breaking, short flying arc. its rated insulation voltage up to 1000V, suitable for AC 50Hz or 60Hz, rated working voltage up to 690V, rated working current from 10A to 800A in the power distribution network, used to distribute power and protect the line and power supply equipment from overload, short circuit and under voltage fault damage; at the same time as the line infrequent. The circuit breaker has an isolation function and its corresponding function is to protect the circuit and power supply equipment from overload, short-circuit and under-voltage faults. This circuit breaker has an isolation function, the corresponding symbols of which are k. The circuit breaker can be installed vertically or horizontally. The product meets the requirements of IEC60947-2 and GB/T14048.2.