Schneider Electric 9999-F2 Electrical Interlock

Schneider Electric’s 9999-F2 Electrical Interlock is a 9999-class interlock kit designed to coordinate a disconnect switch’s mechanism with its control circuit, ensuring the control power is interrupted before the main blades move, a safety feature described by Schneider Electric as “Electrical interlock for breaking the control circuit before the main switch blades break.” This interlock is part of Schneider Electric’s Square D line of safety-interlock kits that accompany disconnects and fuse-switches. Within the 9999 interlock family, catalog numbers ending with the digit 2 indicate a two normally open and two normally closed contacts, a common arrangement for multi-pole interlock kits. The 9999 class is documented by Schneider Electric as Electrical Interlocks, with SPDT and DPDT variants for different switch sizes and series, and is intended to provide proper sequencing between control and main power paths in safety applications. As a member of that family, the 9999-F2 provides a dedicated interlock solution for coordinating control and main power switches in safety-critical panels, helping prevent energizing equipment during maintenance or setup.