Square D 9999SX-6 Electrical Interlock is a single normally open auxiliary contact kit designed for Type S electrical interlock assemblies in size 00-7. This SX6 variant provides one NO contact to interlock control circuits and signal sequencing between a disconnect switch and its operator, helping ensure safe operation when access doors or panels are in position. The 9999 interlock family includes SX6 (one NO contact), SX7 (one NC contact), and SX8 (one NO and one NC), offering flexible interlock options for Square D Type S equipment.
