ABB S203MT-Z0.5NAH10 S200MT miniature circuit breaker featuring a 3P+N configuration, 0.5 A rated current and Z curve characteristic for railway, traction and industrial circuit protection.
The ABB S203MT-Z0.5NAH10 is a specialist 3P+N miniature circuit breaker (MCB) from the ABB S200MT traction and railway series. Developed specifically for railway vehicles, rolling stock and demanding industrial environments, it provides dependable overload and short circuit protection for low-current three-phase circuits with neutral switching.
Featuring a Z tripping characteristic, the S203MT-Z0.5NAH10 is designed for highly sensitive applications requiring rapid magnetic tripping at relatively low fault currents. This makes it particularly suitable for protecting electronic equipment, signalling systems, control circuits, instrumentation and sensitive automation equipment.
With a 0.5 A rated current, 3P+N configuration and compact DIN rail mounted construction, this miniature circuit breaker offers reliable protection while meeting the demanding requirements of railway and transport applications. The S200MT range complies with recognised railway standards and is fully compatible with ABB System pro M compact accessories.
The ABB S203MT-Z0.5NAH10 combines delayed thermal overload protection with instantaneous magnetic short circuit protection to safeguard sensitive electrical circuits. The Z curve characteristic provides very fast magnetic tripping, making it ideal for electronic equipment and circuits where rapid fault clearance is essential.
The S200MT range has been developed specifically for railway applications and complies with recognised international standards for rolling stock. It also offers full compatibility with ABB modular accessories, enabling flexible installation in transport, industrial and automation systems.
| Current | 0.5 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | S200MT |
| Model | S203MT-Z0.5NAH10 |
| Equivalent current model | S203MT-Z0.5NA |
| Product type | Miniature Circuit Breaker (MCB) |
| Rated current | 0.5 A |
| Poles | 3P+N |
| Protected poles | 3 |
| Trip characteristic | Z Curve |
| Rated operational voltage | 440 V AC |
| Rated insulation voltage | 440 V |
| Frequency | 50 / 60 Hz |
| Breaking capacity | 10 kA (IEC/EN 60898-1) |
| Ultimate breaking capacity | 15 kA (IEC/EN 60947-2) |
| Rated service breaking capacity | 11.2 kA |
| Current limiting class | 3 |
| Protection rating | IP20 |
| Mounting type | DIN rail |
| Mechanical endurance | 20,000 operating cycles |
| Dimensions (H × W × D) | approx. 88 × 70 × 69 mm |
The ABB S203MT-Z0.5NAH10 protects low-current three-phase electrical circuits against overloads and short circuits in railway, transport and industrial control applications.
A Z curve MCB provides highly sensitive magnetic tripping and is intended for electronic equipment, instrumentation and specialist control circuits.
The S203MT-Z0.5NAH10 has a 3P+N configuration, providing protection for three phases together with a switched neutral.
The ABB S203MT-Z0.5NAH10 has a rated current of 0.5 A.
Yes. The ABB S200MT series has been specifically developed for railway and traction applications while also being suitable for demanding industrial installations.
ABB S200MT miniature circuit breakers are trusted by railway manufacturers, transport engineers and industrial panel builders for dependable circuit protection, robust construction and long service life in demanding operating 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...