ABB S203-D3 Miniature Circuit Breaker Type D Curve

ABB S203-D3 is a 3-pole miniature circuit breaker from ABB's System Pro M Compact S200 family, designed to protect three‑phase circuits in commercial and light industrial panels. The device is rated at 3 A with a Type D trip curve, providing protection for circuits with moderate inrush currents. It is specified for 400 V AC operation and offers a breaking capacity up to 6 kA at 400 V, helping to interrupt fault currents quickly and safely. The S203-D3 corresponds to ABB part number 2CDS253001R0031 and exemplifies the S200 series' approach to compact, modular protection for distribution panels. Typical applications include protecting small three‑phase loads such as motors, pumps, and control circuitry in commercial facilities, as well as branch circuits in industrial control panels.