The ABB part OT400U04 is an open-style non-fusible disconnect switch designed for applications requiring a high current rating, ranging from 125A to 800A. This switch offers reliable and safe disconnection of electrical power, making it an essential component in various industrial and commercial settings. With its robust construction and uncompromising performance, the ABB OT400U04 is built to withstand demanding operating conditions and deliver optimal performance, ensuring the smooth operation of electrical systems.