ABB 1SCA151025R1001 OXB500E3S2QB 500A 4P 42kA Automatic Transfer Switch

The ABB 1SCA151025R1001 is a 500 A, 4-pole TruONE automatic transfer switch (catalog designation OXB500E3S2QB) built for switching between two independent power sources. It operates on a 200-480 V AC supply, carries a Level 2 DIP controller, and withstands 42 kA for 0.1 s (Icw). The open-style unit uses a delayed I-O-II transition and bottom-fed line terminals.

Technical Specifications

Certifications & Standards

• IEC 60947-6-1

Selection Notes

The switched fourth pole on this 500 A unit breaks the neutral together with the three phases, which TN-S or TT systems with multiple earth points typically need to avoid circulating neutral currents during transfer. The Level 2 DIP controller sets transfer parameters with on-board switches rather than a screen, which fits installations where the settings are configured once at commissioning and rarely changed afterward. Bottom-fed line terminals (QB) suit panels wired with incoming supply below the switch; pick the QT variant instead when busbars feed in from above. For higher continuous-current duty, the 630 A frame in the same OXB TruONE range covers loads this 500 A unit does not.