ABB 1SCA153463R1001 OXB250E3X4QB 250A 3P Level 4 Touch Automatic Transfer Switch

The ABB 1SCA153463R1001 (OXB250E3X4QB) is a three-pole TruONE open-style automatic transfer switch rated 250 A, built to switch between two AC sources from 200 to 480 V. A Level 4 touchscreen controller runs the delayed I-O-II transition, and the bottom-supply / top-load terminal layout suits switchboards fed from below.

Technical Specifications

Certifications & Standards

• IEC 60947-6-1

Selection Notes

This 3-pole, 250 A unit leaves the neutral common between sources instead of switching it, the same arrangement as the DIP and LCD controller versions on this frame. Stepping up to the Level 4 touch controller adds a graphical HMI with event history and parameter access, where the Level 2 and Level 3 units on the same chassis rely on DIP switches or a basic text display. Icw stays at 18 kA for 0.3 s and Uimp at 8 kV, unchanged from the lower-controller siblings on this 250 A frame. QB terminals bring supply in from the bottom and send load out the top; the QT version reverses this for top-fed switchboards.