PR121/P，In=1250A，220-240V AC_ABB_PRODUCT_吉林易择科技技术发展有限公司

Technical Parameters Parameter Specification Manufacturer ABB Product Type Electronic Trip Unit for Air Circuit Breakers Model PR121/P Rated Current Setting (In) Configurable to match breaker rating (e.g., 1250 A) Power Supply / Auxiliary Voltage Typically 220‑240 V AC auxiliary supply for control and indication Protection Functions • Long‑time overload (L) • Short‑time delay (S) • Instantaneous short‑circuit (I) • Ground fault (G) ‑ depending on version (LSIG) Adjustable Settings Overload threshold and trip time range, short‑time delay and level, instantaneous pickup level User Interface Front‑panel DIP switches for setting protection thresholds and timing Indication LED indicators for protection status and trip cause Trip Output Operates breaker trip coil to open circuit under fault conditions Frequency 50 / 60 Hz operation Application Protection of low‑voltage AC distribution circuits in industrial/commercial switchgear Mounting Integrated into compatible ABB ACB protection slot Operating Environment Industrial electrical panels and switchgear

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DESCRIBE

The ABB PR121/P is a digital electronic trip unit designed for use in ABB SACE Emax low‑voltage air circuit breakers. It provides adaptive and adjustable protection against multiple types of overcurrent faults in three‑phase AC power distribution systems. The PR121/P trip unit integrates easily into compatible breakers and allows the user to configure protection settings via front‑panel DIP switches or interface LEDs. It is suitable for use in industrial and commercial electrical panels to protect circuits against overload, short‑time faults, instantaneous short circuits, and optionally ground faults. It is typically paired with breakers rated for In = 1250 A and is often powered by a 220–240 V AC auxiliary/control supply for its internal electronics and signaling functions.

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