ABB S203MT-Z3H01 three pole 3A Z characteristic miniature circuit breaker designed for railway, traction and industrial electrical protection with 10 kA breaking capacity.
The ABB S203MT-Z3H01 is a dependable 3-pole miniature circuit breaker (MCB) engineered for overload and short circuit protection in railway, traction and demanding industrial applications. As part of the ABB S200MT miniature circuit breaker range, it delivers reliable protection whilst meeting the stringent requirements of transport and OEM electrical systems.
Featuring a Z characteristic tripping curve, the S203MT-Z3H01 is ideal for protecting sensitive electronic equipment, signalling systems, control circuits and instrumentation where rapid magnetic tripping at relatively low fault currents is required. Its robust thermal and electromagnetic protection mechanisms help maximise system safety and equipment reliability.
With a 3 A rated current, 3-pole configuration and 10 kA breaking capacity, the ABB S203MT-Z3H01 is perfectly suited to railway vehicles, industrial control panels, automation equipment and OEM machinery requiring dependable three-phase circuit protection.
The ABB S203MT-Z3H01 combines thermal overload protection with rapid electromagnetic short circuit protection to safeguard electrical installations against damaging fault conditions. The Z characteristic enables rapid disconnection where sensitive electronic equipment requires enhanced protection against relatively low fault currents.
Its compact modular construction allows simple installation into DIN rail assemblies whilst maintaining compatibility with ABB accessory modules, making it an excellent choice for modern control panels and railway electrical systems.
| Current | 3 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | S200MT |
| Model | S203MT-Z3H01 |
| Alternative model | S203MT-Z3 |
| Product type | Miniature Circuit Breaker (MCB) |
| Rated current | 3 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 provides overload and short circuit protection for three-phase electrical circuits used in railway, automation and industrial applications.
The ABB S203MT-Z3H01 has a 3 A rated current.
The Z characteristic provides fast magnetic tripping at relatively low fault current levels, making it suitable for 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 control panels.
ABB S200MT miniature circuit breakers are trusted by panel builders, OEMs 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...