Technical Specifications Specification Typical Value / Function Manufacturer ABB Model / Part Number PR122/P‑LSIG Product Type Electronic Trip Unit (Protection Relay) Application Protection for low‑voltage air circuit breakers Protection Functions L – Long‑time (overload) trip S – Short‑time trip I – Instantaneous trip G – Ground fault trip Trip Unit Series PR122/P electronic release Adjustable Stages Long‑time, Short‑time, Instantaneous, Ground‑fault Configuration / Programming Front interface, optional communication modules (e.g., Modbus via add‑on) Self‑Diagnostic Functions Continuous self‑check with alarm indication Display / Indicators LED / digital display for trip status and settings (system‑dependent) Communication / Interface Optional Modbus/fieldbus using add‑on modules Trip Thresholds Adjustable based on current settings (breaker frame dependent) Ground Fault Detection Included in LSIG version (G stage) Standards Compliance IEC 60947‑2 for circuit breaker protection Typical Ambient Temp. Range ‑25 °C to +70 °C (application dependent) Typical Applications Protection of feeders, motors, transformers in industrial and commercial mains distribution