Type S magnetic contactors and starters are for motor control applications. 8903S lighting contactors are for lighting control applications. Type S contacts are easily replaced. This extends the life of the NEMA Size 1 contactor or starters or 30A lighting contactor. This replacement contact kit is for 4 pole 8502SC contactors, 8536SC starters and 8903SM lighting contactors. Kit includes the movable and stationary contacts and needed hardware for 4 poles.