ABB Protecta Plus S203M-B50 Miniature Circuit Breaker • 3 Pole • 50A Type B • 440V AC / 12V DC • 10kA Breaking Capacity • DIN Rail Mount • System pro M Compact • Industrial MCB • 2CDS273001R0505

• THREE-PHASE CIRCUIT PROTECTION – ABB S203M-B50 3-pole 50A miniature circuit breaker protects circuits from overload and short-circuit faults. Designed for DIN rail distribution boards and switchboards used in commercial and industrial installations.
• TYPE B TRIPPING CURVE – Type B tripping operates at 3–5× rated current, providing quick response to overloads and short circuits. Ideal for circuits with low inrush current such as lighting systems, heating equipment and general electrical loads.
• DIN RAIL INSTALLATION – Compact 3-pole breaker mounts on standard DIN rails in switchboards and electrical panels. Screw terminals secure conductors while the contact indicator allows quick visual status checks during operation or maintenance.
• 10KA BREAKING CAPACITY – Rated 10kA to interrupt high fault currents during overload or short circuit events. Thermal and magnetic trip mechanisms disconnect power quickly to help protect wiring, connected equipment and electrical systems.
• ABB PROTECTA PLUS SYSTEM – Part of the ABB Protecta Plus modular distribution system for indoor installations, offering high internal accessibility, removable internal modules for simplified wiring, insulated neutral and earth bars, and an expandable cabinet concept for flexible electrical distribution solutions.

ABB Protecta Plus S203M-B50 Miniature Circuit Breaker is a reliable circuit protection device designed to protect electrical installations from overload and short-circuit faults. It belongs to the ABB System pro M Compact S200M series, widely used in commercial and industrial electrical systems. This 3-pole 50A miniature circuit breaker features a Type B tripping characteristic, allowing fast response to overload conditions and short circuits. It is suitable for circuits with low inrush current such as lighting systems, heating equipment and standard electrical loads. The breaker combines thermal overload protection and electromechanical short-circuit protection to ensure safe operation. With a 10kA breaking capacity, it safely interrupts high fault currents and helps protect wiring, equipment and electrical distribution systems. The compact design allows easy DIN rail installation in switchboards and control panels. Durable construction and secure screw terminals provide reliable connections and long service life in demanding electrical environments. 3-pole miniature circuit breaker 50A rated current Type B tripping characteristic 10kA breaking capacity Rated voltage up to 440V AC / 12V DC DIN rail mounting design Reliable overload and short circuit protection Complies with IEC/EN 60898 standards