The ABB OTM40E4C3D220C is a 4‑pole motorized change‑over and transfer switch designed to transfer electrical loads between two independent AC power sources (such as utility mains and a backup generator) in three‑phase electrical systems. It is part of ABB’s OTM_C series of motorized change‑over switches, which are engineered to provide reliable and safe switching with both automatic (via motor operator) and manual operation modes. The switch includes mechanical interlocks to ensure the two power sources remain isolated and cannot be connected to each other simultaneously. This makes it suitable for industrial, commercial, and critical power applications where continuity of supply is required.
