ABB 1SCA152045R1001 OXB250E3S4QT 250A 4P Level 4 Touch Automatic Transfer Switch

ABB's 1SCA152045R1001 (OXB250E3S4QT) switches 250 A loads across four poles within the TruONE automatic transfer switch range, covering source voltages from 200 to 480 V AC. Its Level 4 touchscreen controller manages the delayed I-O-II transfer sequence, and the top-supply / bottom-load terminal arrangement fits switchboards fed from overhead busbars.

Technical Specifications

Certifications & Standards

• IEC 60947-6-1

Selection Notes

Like its QB sibling, this 4-pole version switches the neutral together with the phases, appropriate for TN-S or TT systems that must not bridge neutrals between sources during transfer. The 18 kA / 0.3 s short-time withstand rating at the 250 A frame is unchanged across controller options, so the choice here comes down to terminal orientation and HMI. QT brings supply in from the top and sends load out the bottom, the mirror image of the QB unit, useful when busbars drop down from an overhead riser. The Level 4 touch controller gives full graphical status and parameter access, where the DIP and LCD controllers in the same frame offer progressively simpler local interfaces.