Supply circuit for domestic appliances, comprises relay and electronic switch which are connected in parallel between mains and load and separately operated by control and zero detecting units

摘要

A relay (R) and electronic switch (TR) are connected in parallel between the mains (PH,N) and a domestic appliance (CH) and are controlled by a control unit (C) and a control circuit (CC). On initiation (SF) the control circuit closes (S1TR) the electronic switch on the next current zero and then closes (S1R) the relay. The electronic switch opens at the next zero leaving the current carried by the relay until the inverse sequence takes place at switch off (SC).