ABB S203MT-Z20 3-pole 20 A miniature circuit breaker with Z characteristic tripping curve and 10 kA breaking capacity for railway and industrial electrical protection.
£231.51
The ABB S203MT-Z20 is a high performance 3-pole miniature circuit breaker (MCB) designed specifically for railway, rolling stock and demanding industrial applications. Part of the proven ABB S200MT series, this circuit breaker provides dependable overload and short circuit protection whilst meeting the stringent requirements of railway installations.
Designed for reliability and long service life, the S203MT-Z20 combines thermal overload protection with rapid electromagnetic short circuit protection. Its Z characteristic tripping curve makes it particularly suitable for protecting sensitive circuits with low inrush current requirements, ensuring fast fault detection whilst minimising unnecessary interruptions.
With a 20 A rated current, 3-pole configuration and 10 kA breaking capacity, the ABB S203MT-Z20 offers outstanding protection for electrical distribution systems in rail vehicles, industrial control panels and specialist automation equipment. Its compact DIN rail mounted design enables quick installation and compatibility with ABB System pro M Compact accessories.
The ABB S200MT range has been engineered for demanding environments where dependable electrical protection is essential. Designed for railway applications compliant with recognised industry standards, these circuit breakers provide consistent protection against overloads and short circuits whilst maintaining reliable operation in challenging conditions.
The Z characteristic tripping curve makes the S203MT-Z20 suitable for specialist circuits requiring rapid fault response with lower magnetic trip thresholds. Its compatibility with ABB accessories allows flexible panel design and simplified maintenance throughout the installation lifecycle.
| Current | 20 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | S200MT |
| Model | S203MT-Z20 |
| Product type | Miniature circuit breaker (MCB) |
| Rated current | 20 A |
| Number of poles | 3 |
| Tripping characteristic | Z |
| Rated breaking capacity | 10 kA |
| Rated voltage | Up to 400 V AC |
| Frequency | 50 / 60 Hz |
| Protection rating | IP20 |
| Mounting type | DIN rail |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2 |
| Typical applications | Railway, rolling stock, industrial control panels and automation systems |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
The S203MT-Z20 protects electrical circuits against overloads and short circuits in railway, rolling stock and industrial applications.
The Z curve provides a lower instantaneous magnetic trip threshold, making it suitable for protecting sensitive electrical circuits with relatively low inrush currents.
The ABB S203MT-Z20 has a 20 A rated current.
This model features a 3-pole configuration, allowing protection of three-phase electrical circuits.
The S203MT-Z20 is designed for standard DIN rail mounting, enabling fast installation inside electrical distribution boards and control panels.
ABB S200MT miniature circuit breakers are trusted throughout the railway and industrial sectors for delivering dependable overload and short circuit protection, long operational life and seamless integration into modern electrical installations.
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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...