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PR121/P-LI

The ABB PR121/P‑LI is an electronic overcurrent protection trip unit designed for integration into compatible ABB low-voltage air circuit breakers. It provides adjustable and coordinated protection for three-phase distribution systems, safeguarding against overloads and instantaneous short-circuit faults. The trip unit is suitable for industrial, commercial, and utility applications, ensuring reliable current protection and system safety.

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Technical Parameters Parameter Specification Manufacturer ABB Model / Type PR121/P‑LI Product Category Electronic Overcurrent Trip Unit Application Protection for ABB low-voltage air circuit breakers Protection Functions • L – Long-time overload protection • I – Instantaneous short-circuit protection Adjustability Adjustable pickup levels and time settings for L and I Trip Output Drives breaker trip coil to open the breaker under fault conditions User Interface Front-panel dials, switches, or software configuration depending on implementation Indication LED or display indicators for protection status and trip cause Auxiliary / Control Supply AC or DC supply to power electronics and indicators Poles Protected 3-phase (L1, L2, L3) Rated Frequency 50 / 60 Hz Mounting Installed within the breaker’s protection slot/interface Standards Compliance IEC low-voltage overcurrent protection standards Typical Supported Breaker Ratings Mid- to high-current frames, depending on breaker model Optional Features Remote signaling, communication via breaker interface (if supported)