Hongfa hf10fh power relays 10a 11 pin plug in 3 pole changeover hongfa hf10fh024a3zdt this 10a 24v 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 hf10fh024a3zdt 3 pole 10a 24vac 11 pin plug in power relay