Schneider Electric 9999-DT-1 Electrical Switch

Schneider Electric Square D 9999-DT-1 Electrical Interlock Kit, Size 2, is an accessory designed to accompany Square D Class 9999 interlock-enabled disconnect systems. The 9999-DT-1 interlock kit provides the required interlock between a disconnect switch and adjacent components, enabling safe operation by coordinating the position of opposing devices and restricting access to energized parts when the system is not in a safe state. Identified as 9999-DT-1 (also listed as 9999DT-1 in some catalogs), this Size 2 kit is intended for use within the Square D interlock family to support proper sequencing and control in industrial enclosures. Typical applications include industrial control panels, motor control centers, and other electrical switchgear assemblies where a dedicated interlock mechanism is needed to meet safety practices and lockout/tagout requirements.