Technical Specifications Specification Typical Value / Description Manufacturer ABB Model / Part Number PR122/P‑LSI Product Type Electronic Trip Unit (overcurrent protection relay) Intended Use Protection for ABB low‑voltage main and feeder circuit breakers Protection Functions Long‑time (L): overload protection Short‑time (S): delayed short‑circuit protection Instantaneous (I): fault level trip Ground‑fault (G) (where supported) Adjustable Settings Adjustable pickup and delay for L, S, I, and G stages Compatible Frame Ratings Breaker frames up to ~2500 A and ~3200 A (3‑pole) Rated Operational Current ~2500 A or ~3200 A depending on breaker frame Poles 3‑pole (3P) applications Rated Operational Voltage Up to ~690 V AC Short‑Circuit Performance Level High discrimination and coordination capability within breaker family Mounting Style Integrated into breaker housing/module Display / Interface Front panel interface or external configuration tool support Standards Compliance Conforms to IEC protection device standards Typical Applications Protection of main feeder circuits, industrial distribution boards, and motor feeders Environmental Operating Range Typical industrial range (e.g., −25 °C to +70 °C)