DNM1D Series breaker with residual current protection external shell (hereinafter called as the breaker) is one new type of breakers produced and developed by us with the international advanced design and manufacturing technology. Its rated insulation voltage is 800V and is applicable to the electromotor which does not frequently switch in the line with AC 50Hz, the rated operation voltage 400V and the rated operation current from 16A to 630A and does not frequently start. The breaker can prevent from the overload, short circuit and under-voltage and can protect the line and power device from damages, meanwhile, it can prevent from the fire caused by the ground failure which has existed for long term and can not be detected during the current protection.

The breaker will be divided into the M type (higher breaking type) and H type (high breaking type) by the breaking capability of the rated limit short circuit (Icu). This breaker features the small volume, high breaking, short splashing arc and shock resistance.