ABB S203MT-Z4NAH10 miniature circuit breaker with Z characteristic, 4 A rated current, 3P+N configuration and 10 kA breaking capacity for industrial and railway applications.
The ABB S203MT-Z4NAH10 is a high-performance three-pole plus neutral (3P+N) miniature circuit breaker (MCB) designed to provide dependable protection for sensitive electrical installations in industrial, railway and transportation applications. As part of the trusted ABB S200MT series, it combines excellent overload and short-circuit protection with robust construction for demanding environments.
Featuring a Z tripping characteristic, this miniature circuit breaker is ideal for protecting sensitive electronic equipment and control circuits where rapid fault disconnection is essential. Its precision tripping performance helps safeguard valuable electrical components while maintaining reliable system operation.
With a 4 A rated current, 3P+N configuration and a 10 kA breaking capacity, the ABB S203MT-Z4NAH10 is an excellent choice for DIN rail mounted distribution boards, industrial control panels and OEM machinery requiring compact, dependable circuit protection.
The ABB S203MT-Z4NAH10 is designed to protect low-voltage electrical circuits against overloads and short circuits whilst ensuring rapid fault clearance for sensitive electronic equipment. Its Z characteristic makes it particularly effective where low magnetic tripping thresholds are required.
Its compact modular design allows straightforward installation within control panels and distribution boards, making it suitable for OEM machinery, industrial automation and railway electrical systems where reliability and safety are critical.
| Current | 4 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | S200MT |
| Model | S203MT-Z4NAH10 |
| Product type | Miniature Circuit Breaker (MCB) |
| Rated current | 4 A |
| Tripping characteristic | Z |
| Number of poles | 3P+N |
| Protected poles | 3 |
| Rated short-circuit breaking capacity | 10 kA |
| Rated insulation voltage | 440 V |
| Frequency | 50 / 60 Hz |
| Protection rating | IP20 |
| Mounting type | DIN rail |
| Terminal type | Screw terminals |
It protects sensitive electrical circuits against overloads and short circuits in industrial, automation and railway applications.
The Z characteristic delivers rapid magnetic tripping at relatively low fault currents, making it ideal for protecting sensitive electronic equipment.
The S203MT-Z4NAH10 features three protected poles with a switched neutral (3P+N).
This model is rated at 4 A with a 10 kA short-circuit breaking capacity.
It is designed for DIN rail installation within industrial control panels, distribution boards, railway systems and OEM machinery.
ABB S200MT miniature circuit breakers are trusted by panel builders, railway engineers and automation specialists for delivering reliable protection, high performance and long service life in demanding 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...