ABB 1SCA150003R1001 OXB500E3S4QB 500A 4P 42kA Automatic Transfer Switch

ABB 1SCA150003R1001, catalog code OXB500E3S4QB, is a 500 A TruONE automatic transfer switch built for 4-pole switching between utility and generator supply. The open-style unit runs on 200-480 V AC, uses a Level 4 Touch controller with a delayed I-O-II transition, holds a 42 kA (0.1 s) Icw rating, and has 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 4 controller adds a touchscreen for on-device commissioning, event logging and diagnostics, useful on sites where a dedicated screen replaces laptop-based setup tools. 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.