ABB S203MT-K50H01 three-pole 50 A miniature circuit breaker with K characteristic and 10 kA breaking capacity, designed for railway, traction and industrial electrical protection.
The ABB S203MT-K50H01 is a high performance three-pole miniature circuit breaker (MCB) developed specifically for demanding railway, rolling stock and traction applications. Part of the proven ABB S200MT series, it combines dependable overload and short circuit protection with robust construction, making it ideal for mission-critical electrical installations.
Designed to comply with both IEC/EN 60898-1 and IEC/EN 60947-2, the S203MT-K50H01 provides excellent current limiting performance while supporting reliable operation in harsh industrial environments. The K characteristic offers fast response to high inrush currents, making it well suited for inductive loads such as motors and transformers.
With a 50 A rated current, three-pole configuration and 10 kA breaking capacity, this DIN rail mounted circuit breaker provides dependable circuit protection for industrial control panels, transportation systems and specialist machinery where reliability and safety are essential.
The ABB S203MT-K50H01 provides dependable protection against overloads and short circuits using both thermal and electromagnetic tripping mechanisms. Its current limiting performance helps reduce fault energy, protecting downstream equipment and improving system reliability.
Designed for demanding transportation and industrial environments, the S200MT range offers long mechanical life, robust construction and compatibility with ABB System pro M Compact accessories, making it suitable for new installations and maintenance projects alike.
| Current | 50 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | S200MT |
| Model | S203MT-K50H01 |
| Product type | Miniature Circuit Breaker (MCB) |
| Rated current | 50 A |
| Number of poles | 3 |
| Tripping characteristic | K |
| Rated operational voltage | 400 V AC |
| Frequency | 50 / 60 Hz |
| Rated short circuit capacity | 10 kA |
| Protection rating | IP20 (IP40 when installed in enclosure) |
| Mounting type | 35 mm DIN rail |
| Terminal type | Screw terminals |
| Dimensions (H × W × D) | 88 × 52.5 × 69 mm |
| Weight | Approx. 0.375 kg |
It provides overload and short circuit protection for three-phase electrical circuits, particularly in railway, traction and industrial applications.
The K curve is designed for circuits with higher inrush currents, making it suitable for inductive loads such as motors and transformers.
The ABB S203MT-K50H01 is a three-pole miniature circuit breaker.
The circuit breaker provides a 10 kA rated short circuit breaking capacity at 400 V AC.
It is designed for installation on a standard 35 mm DIN rail inside suitable electrical distribution boards and control panels.
ABB S200MT miniature circuit breakers are trusted by electrical engineers, machine builders and railway manufacturers worldwide for dependable circuit protection, long service life and reliable performance in demanding environments.
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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...