The ABB OTM40F4C21D380C is a 4‑pole motorized change‑over and automatic transfer switch (ATS) designed to automatically transfer electrical loads between two independent AC power sources (such as utility mains and a backup generator) in three‑phase low-voltage distribution systems. It provides both motorized automatic operation and manual override via a handle. Mechanical interlocks ensure safe isolation of the two power sources, preventing simultaneous connection. This switch is suitable for industrial and commercial installations where reliable continuity of power is required.
