Technical Parameters Parameter Specification Product Name ABB PR122/P‑LI Electronic Protection Trip Unit Model / Version PR122/P‑LI E1/6 Application Protection & trip unit for low‑voltage air circuit breakers Compatible Series ABB SACE Emax (E1 to E6 frames) Protection Functions • Overload (Inverse/Long‑time) • Short‑circuit with adjustable delay • Instantaneous short‑circuit trip Operational Principle Microprocessor‑based electronic protection Self‑Supply Powered by breaker current transformers Installation Front‑mounted on compatible Emax breakers (3 or 4 poles) Adjustable Settings Current thresholds and time delays for L, S, I functions Neutral Handling Neutral protection configurable (e.g., 50%, 100%, 150%, 200% settings) for compatible breaker configurations User Interface LED or display status indication; parameter configuration via front controls Rated Frequency 50 / 60 Hz Operating Temperature Range Typical industrial range Degree of Protection Standard protection when installed in circuit breaker housing Standards Compliance Designed according to IEC low‑voltage switchgear protection requirements Typical Uses Main and feeder protection in low‑voltage distribution systems Optional Modules Communication, measurement, signaling modules (optional addons)