ABB S203MT-Z4 miniature circuit breaker, a 3-pole Z curve 4 A MCB from the S200MT range designed for sensitive circuit protection in traction, railway and industrial control applications.
£210.00
The ABB S203MT-Z4 is a compact and reliable 3-pole miniature circuit breaker (MCB) designed to provide fast and accurate protection for sensitive low-current circuits. As part of the specialist ABB S200MT miniature circuit breaker range, it is engineered for demanding traction, railway and industrial control environments where reliable circuit protection and consistent performance are essential.
This miniature circuit breaker combines thermal overload protection with an electromagnetic short-circuit trip mechanism. The Z characteristic provides rapid tripping at low fault current levels, making it suitable for sensitive electronic equipment, signalling circuits and control systems where fast disconnection helps protect connected components.
With a rated current of 4 A, a 3-pole configuration and a rated short-circuit breaking capacity of 10 kA, the S203MT-Z4 is ideal for low-current three-phase auxiliary and control circuits. Its modular DIN rail design enables straightforward installation inside railway control cabinets, industrial panels and electrical distribution boards.
Miniature circuit breakers such as the ABB S203MT-Z4 protect electrical circuits by automatically disconnecting the supply during overload or short-circuit conditions. This helps reduce the risk of cable damage, component failure and unsafe operating conditions in sensitive control and auxiliary circuits.
The Z curve characteristic is particularly suited to applications where fast operation is required at comparatively low fault current levels. Combined with ABB’s S200MT traction-focused construction, the S203MT-Z4 provides reliable protection for control, signalling and electronic circuits used in transport and industrial automation systems.
| Current | 4 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | S200MT |
| Model | S203MT-Z4 |
| Product type | Miniature circuit breaker |
| Number of poles | 3P |
| Rated current | 4 A |
| Tripping characteristic | Z curve |
| Rated voltage | 440 V AC |
| Frequency | 50 / 60 Hz |
| Rated breaking capacity | 10 kA |
| Rated impulse withstand voltage | 4 kV |
| Current limiting class | 3 |
| Protection rating | IP20 |
| Mounting type | DIN rail mounting |
| Built-in depth | approx. 69 mm |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
The ABB S203MT-Z4 is used to protect sensitive low-current three-phase circuits from overloads and short circuits, particularly in railway, traction and industrial control applications.
The S203MT-Z4 has a rated current of 4 A.
This miniature circuit breaker has a 3-pole configuration.
The Z curve tripping characteristic provides rapid operation at low fault currents, making it suitable for sensitive electronic, control and signalling circuits.
The S203MT-Z4 has a rated short-circuit breaking capacity of 10 kA.
ABB S200MT miniature circuit breakers are trusted by electrical engineers, panel builders and transport specialists to provide reliable protection for sensitive control, signalling and auxiliary circuits in demanding traction 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...