ABB 1SCA151741R1001 OXB500E3S3QB 500A 4P 42kA Automatic Transfer Switch

Carrying catalog designation OXB500E3S3QB, the ABB 1SCA151741R1001 is a 500 A TruONE automatic transfer switch rated for 4-pole, two-source switching duty at 200-480 V AC. A Level 3 LCD controller manages the delayed I-O-II transition, and the open-style unit carries a 42 kA Icw short-time withstand rating with 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 3 controller adds a built-in LCD for on-device transfer-parameter setup and status readout, useful where a technician needs to confirm settings without a separate laptop or HMI. 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.