ABB S203MT-K2NAH10 S200MT miniature circuit breaker, a 3P+N 2 A K curve MCB designed for traction, railway, industrial and low-current circuit protection applications.
The ABB S203MT-K2NAH10 is a specialist 3P+N miniature circuit breaker (MCB) from the ABB S200MT traction and railway series. Designed for demanding railway, transport and industrial environments, it provides dependable overload and short circuit protection for low-current three-phase circuits with neutral switching.
Featuring a K tripping characteristic, the S203MT-K2NAH10 is suitable for circuits with higher inrush currents, including control transformers, power supplies, auxiliary equipment and inductive loads. Its current limiting construction helps reduce fault energy during short circuit conditions, supporting safer and more reliable electrical installations.
With a 2 A rated current, 3P+N configuration and compact DIN rail mounted construction, this ABB miniature circuit breaker is ideal for railway systems, automation panels, control cabinets and industrial distribution assemblies requiring robust low-current circuit protection.
Miniature circuit breakers such as the ABB S203MT-K2NAH10 protect electrical installations by disconnecting circuits during overload or short circuit conditions. The delayed thermal mechanism responds to sustained overloads, while the magnetic mechanism provides rapid tripping during short circuit faults.
The K curve characteristic is useful where connected equipment may produce short-duration inrush currents during energisation. This makes the S203MT-K2NAH10 suitable for auxiliary systems, control transformers, power supplies and specialist railway or industrial applications where dependable protection is essential.
| Current | 2 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | S200MT |
| Model | S203MT-K2NAH10 |
| Equivalent current model | S203MT-K2NA |
| Product type | Miniature Circuit Breaker (MCB) |
| Rated current | 2 A |
| Poles | 3P+N |
| Protected poles | 3 |
| Trip characteristic | K Curve |
| Rated operational voltage | 440 V AC |
| Rated insulation voltage | 440 V |
| Frequency | 50 / 60 Hz |
| Rated short circuit capacity | 10 kA |
| Ultimate breaking capacity | 15 kA |
| Current limiting class | 3 |
| Protection rating | IP20 |
| Mounting type | DIN rail |
| Terminal type | Screw terminals |
| Mechanical endurance | 20,000 operating cycles |
| Dimensions (H × W × D) | approx. 88 × 70 × 69 mm |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2 |
The ABB S203MT-K2NAH10 is used to protect low-current three-phase circuits against overloads and short circuits in traction, railway, industrial and control panel applications.
A K curve MCB is designed for circuits with higher inrush currents, making it suitable for transformers, power supplies and inductive loads.
The S203MT-K2NAH10 has a 3P+N configuration, with three protected poles and a switched neutral.
The ABB S203MT-K2NAH10 has a rated current of 2 A.
Yes. The ABB S200MT series is designed for railway and traction applications while also being suitable for demanding industrial installations.
ABB S200MT miniature circuit breakers are trusted by railway manufacturers, transport engineers and industrial panel builders for dependable circuit protection, compact installation and reliable performance in demanding electrical 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...