Schneider Electric 9999DT10 Electrical Interlock Repair Kit

Schneider Electric's Square D 9999DT10 Electrical Interlock Repair Kit is a replacement kit designed for the 9999 interlock assemblies used with Square D DT and DTU double‑throw safety switches, enabling repair or replacement of worn interlock components without replacing the entire switch. The kit is specifically labeled Type D & T, indicating its compatibility with the D and T interlock configurations used on these switches, and is intended to restore proper interlock operation to maintain safe control of switching sequences. As part of the broader 9999 interlock family from Square D (Schneider Electric), the 9999DT10 aligns with other interlock repair kits designed to service field installations on disconnect switches in industrial and commercial electrical distributions. Because exact specifications can vary by installation, verify compatibility with your DT/DTU device and refer to Schneider Electric interlock documentation to ensure this repair kit matches the switch size and configuration.