ABB 1SCA153456R1001 OXB250E3S2QB 4P 250A 18kA Automatic Transfer Switch

ABB's 1SCA153456R1001, catalog designation OXB250E3S2QB, is a 4-pole, 250 A TruONE automatic transfer switch that switches the neutral with the three phases and withstands 18 kA for 0.3 s. The Level 2 DIP-switch controller sets the basic transfer logic, and supply cabling enters at the bottom with the load wired at the top (QB).

Technical Specifications

Certifications & Standards

• IEC 60947-6-1

Selection Notes

Rated 250 A rather than 200 A, the OXB250E3S2QB sits one step up in current within the same physical frame and terminal style as its 200 A S-coded siblings. Switching the neutral along with the three phases (the S build) suits installations where the neutral itself must be isolated during transfer; the 3-pole X variant is for systems with a common neutral. The Level 2 DIP-switch controller handles basic transfer logic without a display - the Level 3 and Level 4 variants in this frame add that visibility. QB termination brings supply cabling in at the bottom of the enclosure.