The ABB E4.2H 4000A 3‑pole low‑voltage air circuit breaker, part of the ABB SACE Emax 2 series, is a high‑performance industrial circuit breaker designed for heavy‑duty power distribution applications. It delivers dependable protection against overloads, short‑circuits, and fault conditions in main and feeder circuits. The breaker features a robust E4.2H frame, is typically equipped with an electronic trip unit (such as LI or LSI), and can be supplied in a fixed configuration with rear horizontal terminals. This breaker is suitable for integration into switchboards, motor control centers, electrical distribution panels, and other demanding electrical installations requiring high current protection and coordination with downstream protection devices.
