Russelectric RMTDCT4004CE Automatic Transfer Switch

Russelectric RMTDCT4004CE Automatic Transfer Switch is a 400-amp, three‑phase, four‑wire closed‑transition ATS rated for 277/480 VAC operation, engineered to switch between utility and backup power with minimal interruption to the load. It belongs to the Russelectric RMTD‑CT family, where "CT" denotes closed‑transition capability that enables rapid, synchronized transfer between sources. With a high‑speed motor operator, transfers can occur in roughly 100 milliseconds when voltages are within the acceptance window, helping to keep critical loads online during utility events. The design includes front‑accessible wiring and a positive mechanical and electrical interlock to prevent both sources from closing simultaneously, providing dependable isolation and safe operation. Common applications include data centers, hospitals, and other mission‑critical facilities where uninterrupted power is essential; Russelectric ATS are widely used in critical power systems and are manufactured under Siemens ownership for service and support.