ABB S203MT-Z50NA 3P+N 50 A Z curve miniature circuit breaker with 10 kA breaking capacity for railway, traction, industrial and commercial electrical protection.
£424.63
The ABB S203MT-Z50NA is a robust 3P+N miniature circuit breaker (MCB) engineered for railway, traction, rolling stock and demanding industrial electrical installations. As part of the specialist ABB S200MT miniature circuit breaker range, it delivers reliable protection against overloads and short circuits in critical low voltage circuits.
Featuring a Z tripping characteristic, the S203MT-Z50NA is designed for sensitive electrical circuits that require rapid magnetic tripping. Its current limiting design reduces fault energy, helping protect cables, control equipment and connected devices while improving overall system safety.
With a rated current of 50 A, a 3P+N configuration and a 10 kA breaking capacity, this ABB miniature circuit breaker is ideal for three-phase systems with neutral switching. The compact DIN rail mounted design enables straightforward installation within electrical distribution boards and industrial control panels.
The ABB S203MT-Z50NA combines delayed thermal overload protection with fast electromechanical magnetic short circuit protection. This helps maintain reliable operation while reducing the risk of damage to electrical equipment during fault conditions.
The S200MT range has been developed specifically for railway and traction applications, offering dependable performance, compact installation and full compatibility with ABB System pro M Compact accessories for flexible panel design.
| Current | 50 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | S200MT |
| Model | S203MT-Z50NA |
| Product ID | 2CDS273446R0578 |
| EAN | 4016779128322 |
| Product type | Miniature circuit breaker (MCB) |
| Rated current | 50 A |
| Tripping characteristic | Z |
| Number of poles | 3P+N |
| Protected poles | 3 |
| Breaking capacity | 10 kA |
| Rated operational voltage | Up to 440 V AC |
| Frequency | 50 / 60 Hz |
| Protection rating | IP20 |
| Mounting type | DIN rail |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2, UL 1077, CSA 22.2 |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
It protects three-phase electrical circuits with neutral switching against overloads and short circuits in railway, industrial and commercial applications.
The Z characteristic provides rapid magnetic tripping, making it suitable for protecting sensitive electrical and electronic circuits.
The ABB S203MT-Z50NA has a rated current of 50 A.
This model has a 3P+N configuration with three protected poles and a switched neutral.
The circuit breaker is designed for installation on a standard DIN rail within electrical control panels and distribution boards.
ABB S200MT miniature circuit breakers are trusted by railway engineers, panel builders and industrial professionals for dependable circuit protection, compact installation and compliance with recognised international standards.
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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...