ABB 1SCA153462R1001 OXB250E3X3QT 250A 3P Level 3 LCD Automatic Transfer Switch

Switching two independent AC sources at 250 A, the ABB 1SCA153462R1001 (OXB250E3X3QT) is a three-pole TruONE automatic transfer switch rated 200 to 480 V AC with a Level 3 LCD controller for local status and alarm text. The top-supply / bottom-load terminal arrangement fits switchboards fed from an overhead riser.

Technical Specifications

Certifications & Standards

• IEC 60947-6-1

Selection Notes

As a 3-pole unit on the 250 A frame, this switch leaves the neutral common between sources rather than switching it, matching the logic of the QB version of the same Level 3 controller. The LCD display sits between the DIP-switch unit, which has no local readout, and the Level 4 touch unit, which adds graphical diagnostics beyond basic status text. Short-time withstand of 18 kA for 0.3 s and Uimp of 8 kV match every controller variant on this 250 A chassis, so the rating basis does not change with controller choice. QT terminals bring supply in from the top and send load out the bottom, the opposite of the QB layout, for cabling that drops from above.