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 5 contactor or starters or 300A lighting contactor. This replacement contact kit is for 3 pole 8502SG contactors, 8536SG starters and 8903SX lighting contactors. Kit includes the movable and stationary contacts and needed hardware for 3 pole Size 5 device.