Why Choose the ABB S203MT-K40NA Miniature Circuit Breaker?
The ABB S203MT-K40NA is a high-performance 3P+N miniature circuit breaker (MCB) developed for demanding railway, rolling stock and industrial electrical installations. Part of the proven ABB S200MT series, it delivers dependable protection against overloads and short circuits while maintaining excellent reliability in harsh operating environments.
Designed with a K tripping characteristic, this circuit breaker is particularly suited to applications with higher inrush currents, making it ideal for motors, transformers and other inductive loads. Its current limiting design helps minimise fault energy, protecting connected equipment and improving overall system safety.
Rated at 40 A with a 3P+N configuration, the S203MT-K40NA complies with IEC/EN 60898-1 and IEC/EN 60947-2 standards, making it suitable for industrial, commercial and railway applications where reliable circuit protection is essential.
Key Advantages
- High quality ABB S200MT miniature circuit breaker.
- 40 A rated current for demanding electrical installations.
- K characteristic ideal for circuits with high inrush currents.
- 3P+N configuration for three-phase systems with neutral.
- Current limiting technology reduces fault energy.
- Suitable for railway, industrial and commercial applications.
Key Features
- ABB S200MT series.
- 40 A rated current.
- K tripping characteristic.
- 3 protected poles plus switched neutral.
- 10 kA breaking capacity.
- Thermal overload and magnetic short circuit protection.
- DIN rail mounting.
- Compatible with ABB System pro M Compact accessories.
Reliable Protection for Critical Electrical Systems
The ABB S203MT-K40NA provides dependable protection by combining thermal overload protection with instantaneous magnetic short circuit protection. Its current limiting design helps reduce thermal and mechanical stress on connected equipment during fault conditions.
Engineered for railway vehicles and demanding industrial installations, the S200MT range offers long service life, excellent reliability and compatibility with a wide range of ABB accessories for flexible installation and system expansion.
Typical Applications
- Railway and rolling stock electrical systems.
- Industrial distribution boards.
- Motor protection circuits.
- Control panels and switchboards.
- Machine building and OEM equipment.
- Commercial electrical installations.
