ABB 1SCA153615R1001 OXB1250E3S4QT 1250A 4P Touch Controller Top Feed Automatic Transfer Switch

ABB 1SCA153615R1001 (OXB1250E3S4QT) is a 1250 A, 4-pole TruONE automatic transfer switch fitted with a Level 4 touchscreen controller for full on-panel configuration and event logging. Supply terminals are on top, load terminals on the bottom, and the open-style switch covers a 200-480 V AC operating range with a 65 kA / 0.1 s short-time withstand current and delayed transition.

Technical Specifications

Certifications & Standards

• IEC 60947-6-1

Selection Notes

Specify this 1250 A / 4P, top-fed (QT) unit when a Level 4 touchscreen controller is needed but the board only carries distribution-type load (AC-31B) - pick the QB sibling instead where the feeder also includes motor-starting duty, since that version adds AC-32B/AC-33B ratings. Switching the neutral (4P) is relevant specifically when the two sources have separately earthed neutrals; the 3-pole X-series equivalent assumes a common neutral. The delayed I-O-II transition inserts an open interval between sources regardless of controller level.