ABB S203MT-K40H01 miniature circuit breaker from the S200MT series featuring a 40 A rated current, K tripping characteristic and 3-pole configuration for traction, railway and industrial circuit protection.
£152.68
The ABB S203MT-K40H01 is a high-performance miniature circuit breaker (MCB) designed for dependable overload and short-circuit protection in traction, railway and demanding industrial electrical installations. Part of the ABB System pro M compact S200MT series, it is built for applications where robust protection, compact installation and long-term reliability are essential.
With a 40 A rated current and K tripping characteristic, the S203MT-K40H01 is suitable for circuits with higher inrush currents, including motors, transformers, inductive loads and industrial control equipment. Its 3-pole configuration provides coordinated protection across three-phase circuits.
The ABB S203MT-K40H01 combines a compact modular housing, secure screw terminals and DIN rail mounting for efficient installation inside railway cabinets, industrial control panels and distribution boards. Its specialist traction design makes it a dependable choice for professional electrical protection in demanding environments.
Miniature circuit breakers such as the ABB S203MT-K40H01 automatically disconnect electrical circuits when overload or short-circuit conditions occur. This helps protect cables, connected equipment and electrical installations from damage while supporting safer operation.
The K characteristic is designed to tolerate higher starting currents than standard curves, reducing nuisance tripping in circuits with inductive loads. This makes the S203MT-K40H01 suitable for motor circuits, transformers, control gear and specialist traction installations.
| Current | 40 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | S200MT |
| Model | S203MT-K40H01 |
| Alternative model reference | S203MT-K40 |
| Manufacturer part number | 2CDS273006R0557 |
| Product type | Miniature circuit breaker |
| Rated current | 40 A |
| Tripping characteristic | K |
| Number of poles | 3P |
| Rated operational voltage | 400 / 440 V AC |
| Rated frequency | 50 / 60 Hz |
| Rated short-circuit breaking capacity | 10 kA |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2 |
| Terminal type | Screw terminals |
| Mounting type | DIN rail TH35 |
| Protection rating | IP20 |
| Dimensions (H × W × D) | approx. 88 × 52.5 × 69 mm |
| Weight | approx. 0.38 kg |
The ABB S203MT-K40H01 is used to protect three-phase electrical circuits against overloads and short circuits, particularly in railway, traction and industrial applications.
This miniature circuit breaker has a rated current of 40 A.
A K characteristic breaker is designed for circuits with higher inrush currents, making it suitable for inductive loads such as motors, transformers and control equipment.
The ABB S203MT-K40H01 has a 3-pole configuration, providing coordinated protection for three-phase electrical circuits.
The breaker is designed for standard DIN rail mounting inside distribution boards, railway cabinets and electrical control panels.
ABB S200MT miniature circuit breakers are specified by railway engineers, panel builders and industrial electrical professionals for reliable circuit protection in demanding installations.
● 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...