The ABB OTM100F4C21D380C is a 4‑pole motorized automatic transfer switch (ATS) / change‑over switch designed for automatic and manual switching of electrical loads between two independent AC power sources, such as the utility mains and a backup generator, in three‑phase low‑voltage distribution systems. It is part of ABB’s OTM_C_D automatic transfer switch family, which provides reliable open‑transition power source transfer using a motorized operator and supports manual override via a handle.
