ABB S203MT-K40NA 3P+N 40 A K curve miniature circuit breaker with 10 kA breaking capacity for railway, industrial and commercial electrical protection.
£322.51
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.
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.
| Current | 40 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | S200MT |
| Model | S203MT-K40NA |
| Product ID | 2CDS273446R0557 |
| Product type | Miniature circuit breaker (MCB) |
| Rated current | 40 A |
| Tripping characteristic | K |
| Number of poles | 3P+N |
| Breaking capacity | 10 kA |
| Rated operational voltage | Up to 440 V AC |
| Frequency | 50 / 60 Hz |
| Protection rating | IP20 |
| Mounting type | DIN rail |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2 |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
It provides overload and short circuit protection for three-phase electrical circuits used in railway, industrial and commercial applications.
The K curve is designed for circuits with higher inrush currents, making it suitable for motors, transformers and other inductive loads.
The ABB S203MT-K40NA has a rated current of 40 A.
This model features a 3P+N configuration with three protected poles and a switched neutral.
The unit is designed for quick installation onto a standard DIN rail inside distribution boards and electrical control panels.
ABB S200MT miniature circuit breakers are trusted by engineers, OEMs and railway manufacturers for dependable circuit protection, long service life and compliance with recognised international standards.
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LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...