ABB S203-B13 NS 13A 480V 3V Electromechanical Relay

ABB S203-B13 is a 3-pole miniature circuit breaker from the S200 family, delivering 13 A nominal current to protect three‑phase circuits in distribution panels. It uses a Type B tripping characteristic designed to respond to overcurrents with moderate to fast action, making it suitable for general‑purpose protection in commercial and light industrial installations, including distribution boards, motors, and processing lines. The device is rated for nominal voltages up to 400 V AC, with variants that accommodate up to 440 V AC, and it protects three separate conductors on a common trip with a compact DIN‑rail footprint. The rated short‑circuit breaking capacity (Icu) can be up to 20 kA at 230 V AC and up to 10 kA at 400–440 V AC, enabling reliable interruption of fault currents in typical 3‑phase systems, while its dimensions—36 × 86 × 70 mm—and DIN‑rail mounting simplify installation in standard industrial enclosures. With three protected poles and a robust mechanical design, it supports safe operation in control panels and is compatible with common ABB S200 accessories for straightforward panel builds.