Schneider Electric Dual Power Transfer Switch – Model WATSNB‑400/400 4CBR The WATSNB‑400/400 4CBR is a manual or automatic dual power changeover (transfer) switch / dual input selector switch designed for switching a load between two independent power sources (such as utility and generator). It is used in electrical distribution systems to ensure continuity of power by selecting between two available supplies. The “4CBR” suffix indicates a 4‑pole configuration with built‑in control and safety contacts for interlocking and signaling, conforming to typical industrial dual power switch conventions.
