PR121/P 3P_ABB_PRODUCT_吉林易择科技技术发展有限公司

Typical Technical Parameters Specification Details Product Type Electronic Trip Unit / Protection Relay Model / Part Family PR121/P Intended Use Protection unit for ABB SACE Emax low‑voltage air circuit breakers Applicable Poles 3‑pole (3P) and also compatible with 4‑pole breakers Protection Functions Overload (long‑time), short‑time, instantaneous short‑circuit, earth (ground) fault protection (depending on version) Technology Digital microprocessor‑based unit Self‑Supply No external power required for core protection functions; self‑supplied from sensed current Adjustable Settings Adjustable current thresholds and time delays for protective functions Neutral Protection Setting Configurable (OFF / 50% / 100% / 200% of phase current where applicable) Trip Cause Indication LED indicators and trip history User Interface DIP switches or configuration tools for setting protection parameters Optional Interfaces Connectivity with external modules (for remote signaling, communications, test interfaces) Rated Frequency 50/60 Hz Compliance Designed for IEC low‑voltage circuit breaker standards (trip functions compatible with IEC/EN 60947‑2)

Grace +86 13600179521

DESCRIBE

The ABB PR121/P is a high‑performance electronic protection and trip unit designed for use with ABB SACE Emax low‑voltage air circuit breakers. It provides advanced overcurrent protection with configurable settings, enabling precise control of breaker trips for overload, short‑circuit, and earth‑fault conditions. The unit employs microprocessor technology for reliable and accurate detection, setting adjustment, and trip cause indication without the need for an external power supply. It supports integration with optional modules for remote monitoring and alarm signaling.

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