ABB S203MT-C20NA miniature circuit breaker, a 20 A 3P+N C curve MCB from the System pro M Compact S200MT range for traction, railway and specialist industrial circuit protection.
£166.85
The ABB S203MT-C20NA is a specialist miniature circuit breaker (MCB) from the ABB System pro M Compact S200MT series, designed for traction, railway and demanding industrial electrical applications. Featuring a C characteristic trip curve, it provides dependable overload and short circuit protection for circuits with moderate inrush currents.
The S200MT range is engineered for transport environments where reliability, compact installation and electrical safety are essential. This MCB combines delayed thermal overload protection with electromechanical short circuit protection, helping protect electrical circuits in rolling stock, rail infrastructure and specialist industrial control panels.
With a rated current of 20 A, a 3P+N configuration and a 10 kA breaking capacity, the S203MT-C20NA is ideal for three-phase circuits requiring neutral switching in traction, railway and specialist industrial installations.
The ABB S203MT-C20NA automatically disconnects electrical circuits during overloads and short circuits. Its thermal tripping mechanism protects against prolonged overload conditions, while the electromechanical mechanism reacts rapidly to fault currents, helping reduce equipment damage and minimise downtime.
The S200MT series has been developed for railway and traction applications, making it suitable for rolling stock, transport infrastructure and industrial systems requiring reliable circuit protection and compact DIN rail installation.
| Current | 20 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | System pro M Compact S200MT |
| Model | S203MT-C20NA |
| Product type | Miniature circuit breaker (MCB) |
| Rated current | 20 A |
| Number of protected poles | 3 |
| Neutral pole | Switched neutral |
| Pole configuration | 3P+N |
| Trip characteristic | C |
| Rated operational voltage | 400 V AC |
| Rated insulation voltage | 440 V |
| Rated impulse withstand voltage | 4 kV |
| Frequency | 50 / 60 Hz |
| Breaking capacity | 10 kA |
| Protection rating | IP20 |
| Mounting type | DIN rail |
| Built-in depth | approx. 69 mm |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2, UL 1077, CSA 22.2 |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
It provides overload and short circuit protection for three-phase circuits used in traction, railway and specialist industrial electrical systems.
The C curve is designed for circuits with moderate inrush currents, making it suitable for control panels, electrical distribution and general industrial equipment.
The ABB S203MT-C20NA has a rated current of 20 A.
It provides three protected phase poles together with a switched neutral pole for three-phase installations.
Yes. The ABB S200MT range is designed for traction and railway applications, including rolling stock and transport infrastructure.
ABB System pro M Compact S200MT miniature circuit breakers are trusted by railway engineers, panel builders and industrial professionals for dependable circuit protection in demanding transport and electrical applications.
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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...