ABB S203MT-K25 3-pole 25 A miniature circuit breaker with K characteristic tripping curve and 10 kA breaking capacity for railway, traction and industrial circuit protection.
£196.61
The ABB S203MT-K25 is a reliable 3-pole miniature circuit breaker (MCB) designed for dependable overload and short circuit protection in railway, traction and demanding industrial applications. As part of the specialised ABB S200MT miniature circuit breaker series, it is engineered for installations where compact size, high breaking capacity and long-term operational reliability are essential.
This circuit breaker uses a delayed thermal tripping mechanism for overload protection and an electromagnetic tripping mechanism for short circuit protection. Its K characteristic tripping curve makes it suitable for circuits with higher inrush currents, including motors, transformers, auxiliary railway systems and industrial control equipment.
With a 25 A rated current, 3-pole configuration and 10 kA breaking capacity, the ABB S203MT-K25 provides robust protection for three-phase circuits. Its DIN rail mounted format supports quick installation in rolling stock electrical systems, distribution boards, control cabinets and machine panels.
The ABB S200MT range is designed especially for traction and railway applications, providing dependable protection in electrical systems exposed to demanding operational conditions. These miniature circuit breakers help protect conductors, equipment and control circuits from damage caused by overloads and short circuits.
The K curve characteristic of the S203MT-K25 provides a higher instantaneous trip threshold than standard general-purpose curves, making it well suited for inductive loads where temporary start-up currents may occur. This makes it a practical choice for motors, transformers, solenoids and railway auxiliary circuits.
| Current | 25 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | S200MT |
| Model | S203MT-K25 |
| Product type | Miniature circuit breaker (MCB) |
| Product ID | 2CDS273445R0517 |
| EAN | 4016779126700 |
| Rated current | 25 A |
| Number of poles | 3 |
| Tripping characteristic | K |
| Rated short circuit breaking capacity | 10 kA |
| Rated operational voltage | 400 V AC |
| Rated insulation voltage | 440 V |
| Rated impulse withstand voltage | 4 kV |
| Frequency | 50 / 60 Hz |
| Protection rating | IP20 |
| Mounting type | DIN rail |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2, UL 1077, CSA 22.2 No. |
| Typical applications | Railway, rolling stock, traction systems, industrial control panels and three-phase distribution circuits |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
The S203MT-K25 is used to protect three-phase electrical circuits against overloads and short circuits in railway, traction and industrial applications.
The ABB S203MT-K25 has a 25 A rated current.
The K curve is designed for circuits with higher inrush currents, making it suitable for inductive loads such as motors, transformers and control equipment.
This model has a 3-pole configuration, making it suitable for three-phase circuit protection.
Yes, the S200MT range is designed especially for traction and railway applications, including rolling stock electrical systems.
ABB S200MT miniature circuit breakers are trusted by railway engineers, panel builders and industrial electrical professionals for reliable protection, compact installation and long-term performance in demanding low voltage systems.
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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...