The ACB, which are characteristic of ergonomic design, convenient usage, all-case intelligence, high-breaking capacity, zero arcing distance and isolation functions etc. and which has shaped the brand-new image of the new generation. The Intelligent Universal Circuit Breakers take the role of distribuing power and protecting wires and equipments from being damaged by overload, short circuit, under-voltage and gound-fault etc. in the power-distribution circuit of AC50HZ, rated working voltage 400V or 690V, rated working current 6300A or below.