ABB 2CDS253001R0558 Miniature Circuit Breaker

ABB S203-Z40, part number 2CDS253001R0558, is a three-pole DIN-rail miniature circuit breaker designed for 400 VAC distribution panels. It provides overload and short‑circuit protection with a 40 A rated current (In 40 A) and a 6 kA short‑circuit breaking capacity, making it suitable for three‑phase circuits in commercial and light‑industrial installations. The device uses a Z‑characteristic trip curve, offering a defined time‑delay response to moderate fault currents while tripping at higher fault levels to safeguard downstream equipment. With an IP20 enclosure rating and a weight of approximately 0.375 kg, it is built for indoor use in standard low‑voltage distribution boards. The S203‑Z40 is designed for mounting on conventional DIN rails, enabling straightforward installation and replacement within ABB‑based panels. This model is cataloged under 2CDS253001R0558 and represents ABB’s S203 family of protective devices for 400 V systems, delivering reliable protection for downstream loads against overloads and short circuits in three‑phase circuits.