Square D 9999R26 SPDT Combination Starter Auxiliary Contact Interlock

A one pole electrical interlock can be added to a disconnect switch or circuit breaker. This disconnect is used to de-energize a magnetic starter with separate control circuit when the disconnect is switched to the off position. Disconnect switch has one SPDT contact. It has one normally open and one normally closed contact. This disconnect switch is used on 8539 and 8739 circuit breaker combination starter from NEMA Size 0 through 5. It is also used on 8903S combination lighting contactors. 9422R and 9422C circuit breaker operating mechanism also use this disconnect switch.