A reduced arcing contact switching circuit. It is desirable to control the switching of electrical contacts so that opening and closing occur at the time when zero power is being transferred to the load so as to substantially reduce arcing at the contacts and thus extend contact life. In a purely resistive...http://www.google.es/patents/US4864157?utm_source=gb-gplus-sharePatente US4864157 - Reduced arcing contact switching circuit
