Schneider Electric Dual Power Automatic Transfer Switch – WATSNB‑80/4PCR is a dual power automatic transfer switch for three-phase electrical systems. It reliably switches the load between two independent AC power sources, such as utility mains and a backup generator. The switch ensures continuity of supply by detecting loss or return of the primary source and transferring the load to the alternate source automatically or manually. The 4‑pole configuration switches all three phase conductors plus neutral, providing full isolation and safety for critical loads in industrial and commercial distribution applications.