ABB S203UP-K20 Circuit Breaker

ABB S203UP-K20 is a three-pole miniature circuit breaker from ABB’s System pro M compact family, designed for AC branch-circuit protection in 3‑phase distributions. It is rated for 20 A and 240 V AC, intended for AC use only, and is suitable for DIN-rail mounting in distribution panels. This device belongs to the S200UP/S203UP series and carries the order code 2CDS273317R0487, with an approximate weight of 0.42 kg per unit. In practical terms, it protects downstream loads on a 3‑phase circuit from overload and short-circuit conditions, providing automatic disconnection when fault current exceeds the set rating. As part of ABB’s System pro M compact platform, the S203UP‑K20 integrates with other S200U/S203UP devices for coordinated protection in industrial or commercial panels.