Schneider Electric's 9999-SX-11 Electrical Interlock (also cataloged as 9999SX11) is an internal, single normally-open auxiliary contact kit for NEMA Type S motor starters and contactors in the Class 9999 interlock family. It provides one normally-open (NO) contact, is nonconvertible, and supports operation up to 600 V, with availability across NEMA Sizes 00–7. This interlock accessory is designed to replace the holding-circuit contact supplied with 9999 SX interlock configurations, enabling proper sequencing of disconnect devices.
