This motor starter relay is compatible with models 15-437, 15-450, SAZ-4201EA, 10A-F1035, 7-1035, SFD6009, PL15-450, 240-14004, and 66-203.Constructed with copper, EPDM, and metal materials, it assists in engine cranking and reduces current load on the startup switch.The relay operates at 12V.Terminal B is for power connection and terminal M is for motor connection; do not connect in the opposite direction.Package includes one starter relay.