Square D Sk500G1 Transformer Disconnect Switch

Square D 9070 SK500G1 Transformer Disconnect, Series A, is a compact 500 VA, single‑phase transformer disconnect designed to mount inside or outside a control enclosure and provide a dedicated disconnect for control transformers that powers auxiliary single‑phase loads when the main three‑phase disconnect is either ON or OFF. It is rated for 600 V and 45 A with a 100 kA short‑circuit current rating when protected with appropriate primary protection, and supports 50/60 Hz operation with primary voltages of 120/240/480 VAC. The enclosure is NEMA 1, suitable for indoor installations, and this SK500G1 model sits within Schneider Electric’s Square D 9070 transformer disconnect lineup to streamline panel wiring and safety in automation systems. Variants in the SK500G1 family include configurations with outlets (for example SK500G1D1G13), offering built‑in receptacle options for auxiliary power. Common applications include supplying relay coils, timers, indicators, and other auxiliary loads directly from the control transformer in industrial automation, building automation, and manufacturing environments.