FNB2L (electronic & electromagnetic ) RCCB are applying to the circuit of 50/60HZ/230VAC single phase, 400VAC three phases& prevent electric fire and personal casualty accident caused by personal electric shock or leakage of electric wire netting, it is a current-operated, fast leakage protector of pure electromagnetic type, which can break off fault circuit rapidly in order to avoid occurrence of accident. The function of the switch won't be influenced by ambient temperature& lightning.

The mutual inductor of the item is used to test vector differential value of passing current &produces a relevant output power and add it to the tripper in secondary winding, if the current of vector differential value of protecting the circuit of personal electric shock is up to or over leakage operating current, the tripper will act & cut off so that the item will take effect of protection.