ABB S203MT-Z4H01 three pole 4A Z characteristic miniature circuit breaker designed for railway, traction and industrial electrical protection with 10 kA breaking capacity.
The ABB S203MT-Z4H01 is a premium 3-pole miniature circuit breaker (MCB) designed to provide dependable overload and short circuit protection in railway, traction and industrial electrical installations. As part of the proven ABB S200MT miniature circuit breaker range, it delivers high reliability for demanding environments where safety and continuous operation are essential.
Featuring a Z characteristic tripping curve, the S203MT-Z4H01 is specifically designed to protect sensitive electronic equipment, signalling systems, instrumentation and control circuits. Its rapid magnetic tripping response helps disconnect fault currents quickly, reducing the risk of damage to valuable electrical components.
With a 4 A rated current, 3-pole configuration and 10 kA breaking capacity, the ABB S203MT-Z4H01 is ideally suited to railway rolling stock, industrial control panels, automation systems and OEM machinery requiring dependable three-phase circuit protection.
The ABB S203MT-Z4H01 combines thermal overload protection with instantaneous magnetic short circuit protection to safeguard electrical installations from damaging fault conditions. Its Z characteristic enables rapid disconnection where electronic equipment and precision control systems require enhanced protection against relatively low fault currents.
Its compact modular construction allows straightforward installation on standard DIN rails whilst maintaining compatibility with ABB accessories, making it an excellent solution for modern industrial control panels and railway electrical equipment.
| Current | 4 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | S200MT |
| Model | S203MT-Z4H01 |
| Alternative model | S203MT-Z4 |
| Product type | Miniature Circuit Breaker (MCB) |
| Rated current | 4 A |
| Tripping characteristic | Z |
| Number of poles | 3 |
| Rated operational voltage | Up to 400 V AC |
| Rated insulation voltage | 440 V |
| Frequency | 50 / 60 Hz |
| Rated short circuit capacity | 10 kA |
| Protection rating | IP20 |
| Mounting type | DIN rail |
| Dimensions (H × W × D) | approx. 88 × 52.5 × 69 mm |
| Weight | approx. 0.375 kg |
It protects three-phase electrical circuits against overloads and short circuits in railway, industrial and automation applications.
The ABB S203MT-Z4H01 has a 4 A rated current.
The Z characteristic provides rapid magnetic tripping at relatively low fault current levels, making it suitable for protecting sensitive electronic equipment and control circuits.
This model features a 3-pole (3P) configuration for three-phase electrical protection.
The circuit breaker is designed for installation on a standard DIN rail inside electrical distribution boards and industrial control panels.
ABB S200MT miniature circuit breakers are trusted by OEMs, panel builders and railway engineers for delivering dependable electrical protection in demanding transportation and industrial 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...