ABB SACE PR331-LSI Circuit Breaker Trip Unit

ABB SACE PR331-LSI is an electronic trip unit designed for ABB SACE Tmax T7/T8 circuit breakers, delivering LI and LSI protection functions as part of the PR331/P family that also includes LSIG variants. The PR331/P family supports LI, LSI, and LSIG functions, and PR331-LSI specifically enables long-time and short-time/instantaneous protection logic. When paired with a Tmax T8L 2000 A three-pole breaker, the PR331/P-LSI variant is specified for IN = 2000 A and front-terminal installations. The unit provides electronic protection and operating logic for abnormal currents, serving as the protection/monitoring component within ABB SACE protection systems.