ABB S203MT-K25NA 3P+N miniature circuit breaker with 25 A rated current, K curve tripping characteristic and 10 kA breaking capacity for railway and industrial circuit protection.
£276.45
The ABB S203MT-K25NA is a robust 3P+N miniature circuit breaker (MCB) from the ABB System pro M compact S200MT series. Designed for traction, railway and demanding industrial applications, it provides reliable protection against overloads and short circuits in electrical systems where dependable performance and compact installation are required.
The S200MT range uses ABB's current-limiting technology with a delayed thermal tripping mechanism for overload protection and an electromechanical tripping mechanism for short-circuit protection. Its K curve characteristic is designed for circuits with higher inrush currents, making it suitable for motors, transformers, contactors and other inductive loads.
With a 25 A rated current, 3P+N configuration and 10 kA breaking capacity, the S203MT-K25NA provides professional-grade protection for three-phase circuits requiring neutral switching. Its DIN rail format makes it suitable for railway electrical enclosures, industrial control panels, automation systems and commercial distribution boards.
Miniature circuit breakers protect electrical circuits by automatically disconnecting the supply when overloads or short circuits occur. The ABB S203MT-K25NA combines thermal and magnetic tripping performance to help protect cables, components and connected equipment from electrical faults.
The K curve characteristic is suitable for applications where temporary inrush currents occur during normal operation. This makes the S203MT-K25NA a strong choice for motor circuits, transformer supplies, railway auxiliary systems and industrial control equipment.
| Current | 25 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | System pro M compact S200MT |
| Model | S203MT-K25NA |
| Product ID | 2CDS273106R0517 |
| Product type | Miniature circuit breaker (MCB) |
| Rated current | 25 A |
| Tripping characteristic | K |
| Number of poles | 3P+N |
| Protected poles | 3 |
| Rated operational voltage | 400 V AC |
| Rated insulation voltage | 440 V |
| Frequency | 50 / 60 Hz |
| Rated short-circuit breaking capacity | 10 kA |
| Rated ultimate short-circuit breaking capacity | 15 kA |
| Protection rating | IP20 |
| Mounting type | DIN rail |
| Terminal type | Screw terminals |
| Built-in depth | approx. 69 mm |
| Dimensions (H × W × D) | approx. 88 × 70 × 69 mm |
| Weight | approx. 0.50 kg |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
The ABB S203MT-K25NA is used to protect three-phase circuits with neutral against overloads and short circuits in railway, industrial and commercial installations.
The ABB S203MT-K25NA has a 25 A rated current.
A K curve breaker is designed for circuits with higher inrush currents, such as motors, transformers, contactors and other inductive equipment.
The S203MT-K25NA has a 3P+N configuration, with three protected poles and a switched neutral.
The ABB S203MT-K25NA is designed for standard DIN rail mounting inside distribution boards, control panels and railway electrical enclosures.
ABB System pro M compact S200MT miniature circuit breakers are trusted by railway engineers, panel builders and industrial electricians for reliable protection, compact installation and dependable performance in demanding electrical systems.
● Service Agreements
Credit Accounts
Our service agreements are built to support long term procurement relationships. By working closely with engineering teams and procurement departments, we help streamline purchasing processes while ensuring consistent access to critical components and sourcing support when it matters most.
● frequently asked questions
At Led Controls Ltd we help engineers source the right automation and control gear with confidence. below are quick answers to what we are asked most often.
We supply all leading manfacturers in our industry. we offer next day delivery on most poplour products.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
● latest blog
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...