ABB S203MT-K1NA 3P+N miniature circuit breaker with 1 A rated current, K curve tripping characteristic and 10 kA breaking capacity for railway and industrial circuit protection.
£332.33
The ABB S203MT-K1NA is a compact and reliable 3P+N miniature circuit breaker (MCB) from the ABB System pro M compact S200MT series. Designed for traction, railway and industrial applications, it provides dependable protection against overloads and short circuits in demanding electrical environments.
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 suitable for inductive loads and circuits where temporary inrush currents may occur during normal operation.
With a 1 A rated current, 3P+N configuration and 10 kA breaking capacity, the S203MT-K1NA provides sensitive low-current protection for three-phase circuits requiring neutral switching. Its compact DIN rail design makes it suitable for railway electrical systems, control panels, automation equipment and OEM installations.
Miniature circuit breakers protect electrical circuits by automatically disconnecting the supply when overloads or short circuits occur. The ABB S203MT-K1NA combines thermal and magnetic tripping performance to help protect cables, components and connected equipment from electrical faults.
The K curve characteristic provides reliable protection for circuits where temporary inrush currents are expected. This makes the S203MT-K1NA suitable for control transformers, inductive loads, auxiliary circuits and railway electrical systems requiring dependable low-current protection.
| Current | 1 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | System pro M compact S200MT |
| Model | S203MT-K1NA |
| Product ID | 2CDS273106R0217 |
| Product type | Miniature circuit breaker (MCB) |
| Rated current | 1 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 |
| 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-K1NA is used to protect low-current three-phase circuits with neutral against overloads and short circuits.
The ABB S203MT-K1NA has a 1 A rated current.
A K curve breaker is designed for circuits with higher inrush currents, such as inductive loads, control transformers and industrial equipment.
The S203MT-K1NA has a 3P+N configuration, with three protected poles and a switched neutral.
The ABB S203MT-K1NA 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.
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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...