E4S4000 PR121/P-LSIG In=4000a 4P WHR_ABB_PRODUCT_吉林易择科技技术发展有限公司

Technical Parameters Parameter Specification Manufacturer ABB Series / Family SACE Emax E4S Product Type Air Circuit Breaker (ACB), Withdrawable Model Code E4S4000 PR121/P‑LSIG Configuration 4‑pole (3-phase + neutral) Rated Continuous Current (In / Iu) 4000 A Rated Operational Voltage (Ue) Up to 690 V AC Rated Insulation Voltage (Ui) 1000 V AC Rated Impulse Withstand Voltage (Uimp) 12 kV Trip Unit PR121/P‑LSIG Electronic Overcurrent Protection Protection Functions Long-time (L), Short-time (S), Instantaneous (I), Ground fault (G) Short-Circuit Breaking Capacity (Icu) ~75 kA Service Short-Circuit Breaking Capacity (Ics) ~75 kA Short-Time Withstand Current (Icw) ~75 kA (1 s / 3 s) Rated Frequency 50 / 60 Hz Terminal / Connection Type Withdrawable mounting (WHR) for switchgear Standards Compliance IEC low-voltage circuit breaker standards Typical Applications Main distribution, feeder protection, industrial switchgear

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DESCRIBE

The ABB E4S4000 PR121/P‑LSIG 4‑pole WHR Air Circuit Breaker is a high‑capacity low‑voltage protection device from ABB’s SACE Emax E4S series designed for three‑phase industrial and commercial electrical distribution systems. It features a PR121/P‑LSIG electronic trip unit, which provides advanced adjustable protection against overloads, short circuits, instantaneous faults, and ground fault conditions. The breaker’s withdrawable (WHR) design allows safe extraction and servicing within a switchgear frame without disconnecting the main busbar connections. This unit is suitable for use as a main distribution feeder breaker, critical load protection, or industrial power system breaker where high reliability and protection performance are required.

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