The ASCO D03ATSA30104NG0C is a Series 300 D-frame automatic transfer switch rated for 104 A at 480 V in a three‑phase, open‑transition configuration. It uses a 3‑pole design and is housed in a Type 1 (NEMA 1) enclosure, built to handle routine automatic transfers between primary and standby power sources. This model is designed to automatically switch loads to maintain power continuity when a source fails or becomes unreliable, delivering seamless transfer between sources for electrical systems that require reliable, hands‑off operation.
