ABB S203MT-Z50H01 three-pole 50 A miniature circuit breaker with Z characteristic and 10 kA breaking capacity for railway, traction and industrial electrical protection.
The ABB S203MT-Z50H01 is a premium three-pole miniature circuit breaker (MCB) engineered for demanding railway, traction and industrial electrical applications. As part of the robust ABB S200MT series, it delivers dependable protection against overloads and short circuits while meeting the stringent requirements of rolling stock and transportation infrastructure.
Manufactured to comply with IEC/EN 60898-1 and IEC/EN 60947-2, the S203MT-Z50H01 combines excellent current limiting performance with high breaking capacity. Its Z characteristic provides highly sensitive magnetic tripping, making it particularly suitable for protecting sensitive electronic equipment, control circuits and semiconductor devices where rapid fault disconnection is essential.
With a 50 A rated current, three-pole configuration and 10 kA breaking capacity, this DIN rail mounted circuit breaker offers reliable protection for industrial control panels, transportation systems and specialist machinery operating in demanding environments.
The ABB S203MT-Z50H01 uses thermal and electromagnetic tripping mechanisms to protect electrical installations against overloads and short circuits. Its highly sensitive Z characteristic enables rapid disconnection during fault conditions, helping safeguard electronic equipment and sensitive control systems.
Developed specifically for railway and industrial environments, the S200MT range features robust construction, high current limiting capability and compatibility with ABB System pro M Compact accessories, providing dependable protection throughout the life of the installation.
| Current | 50 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | S200MT |
| Model | S203MT-Z50H01 |
| Product type | Miniature Circuit Breaker (MCB) |
| Rated current | 50 A |
| Number of poles | 3 |
| Tripping characteristic | Z |
| Rated operational voltage | Up to 440 V AC |
| Frequency | 50 / 60 Hz |
| Rated short circuit capacity | 10 kA |
| Protection rating | IP20 |
| Mounting type | 35 mm DIN rail |
| Terminal type | Screw terminals |
| Dimensions (H × W × D) | 88 × 52.5 × 69 mm |
| Weight | Approx. 0.375 kg |
It protects three-phase electrical circuits against overloads and short circuits, particularly where sensitive equipment requires fast fault disconnection.
The Z characteristic provides a very sensitive magnetic trip designed to protect electronic equipment, control circuits and semiconductor devices from short circuit faults.
The ABB S203MT-Z50H01 is a three-pole miniature circuit breaker.
The circuit breaker provides a 10 kA short circuit breaking capacity for dependable protection.
It is designed for installation on a standard 35 mm DIN rail inside electrical distribution boards, industrial control panels and railway equipment.
ABB S200MT miniature circuit breakers are trusted by electrical engineers, OEMs and railway manufacturers worldwide for dependable circuit protection, long service life and reliable performance in demanding 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...