ABB ST203M-K16 Industrial Safety Relay Module

ABB ST203M-K16 is a three-pole miniature circuit breaker (MCCB) designed to protect three-phase electrical circuits in industrial control panels from overload and short circuits. It is rated for 16 A and provides a short-circuit breaking capacity of 10 kA, with a Type K (K-curve) tripping characteristic that balances protection with acceptable nuisance tripping for circuits with moderate inrush currents. The device is built for standard AC mains applications around 230/400 V and is commonly used to safeguard motors, drives, and other three-phase loads in manufacturing environments. Its compact, clearly marked design supports straightforward installation and wiring within distribution boards, enabling reliable protection without additional accessories. As part of ABB's S203M family of circuit breakers, ST203M-K16 coordinates with ABB distribution equipment to deliver predictable, industry-grade protection in control cabinets and panel boards. Suitable for panel builders and installers, the ST203M-K16 is commonly stocked by distributors and used in commercial and industrial electrical installations requiring dependable three-phase protection.