The Schneider Electric WATSNB‑160/100‑4P series are dual power automatic transfer switches designed for three‑phase low‑voltage power distribution systems. They are used to automatically or manually transfer a three‑phase load between two independent AC power sources (for example, utility/main and generator). These devices ensure continuity of electrical supply for critical loads by detecting a loss or return of the main supply and switching to the alternate source accordingly. The 4‑pole configuration switches all three phase conductors and the neutral for full isolation and safety. Variants with suffixes like 4CBR‑F include auxiliary/feedback contacts and additional safety control interfaces for remote indication and integration with automation systems.
