The ABB OTM80E4C3D220C is a 4‑pole motorized change‑over and transfer switch designed to transfer electrical loads between two independent AC power sources (for example, between utility mains and a backup generator) in three‑phase low‑voltage power systems. It belongs to ABB’s OTM series of motorized transfer switches, which are used to provide automatic and manual switching of power sources while ensuring safe isolation and continuity of service. The switch supports motorized automatic operation (when connected with an external control unit) as well as a manual override via a handle for local operation. Mechanical and electrical interlocks help prevent both power sources from being connected simultaneously, enhancing system safety.
