Hongfa hf10fh power relays 10a 11 pin plug in 3 pole changeover hongfa hf10fh120a3zdt this 10a 120v ac plug in power relay is a robust device that has high electrical and mechanical endurance features include silver alloy contacts and a lockable push to test button hongfa hf10fh120a3zdt 3 pole 10a 120vac 11 pin plug in power relay