Type S magnetic contactors and starters are for motor control applications and 8903S lighting contactors are for lighting control applications. This Hand Off Auto selector switch kit is for NEMA size 00 through 3 Type S contactors and starters or 8903SM or 8903SP lighting contactors in NEMA 1 enclosure. The selector switch is mounted into the knockout in the enclosure cover. This selector switch kit is UL listed and CSA certified.