ABB S203MT-Z20NAH10 miniature circuit breaker with Z characteristic, 20 A rated current, 3P+N configuration and 10 kA breaking capacity for industrial, railway and automation applications.
The ABB S203MT-Z20NAH10 is a premium three-pole plus neutral (3P+N) miniature circuit breaker (MCB) designed to provide dependable overload and short-circuit protection for industrial, railway and transportation electrical systems. As part of the specialist ABB S200MT series, it is engineered specifically for demanding low-voltage installations where reliability, safety and long service life are essential.
Featuring a Z tripping characteristic, this miniature circuit breaker is ideal for protecting sensitive electronic equipment, PLCs, signalling systems and control circuits requiring rapid magnetic tripping at relatively low fault currents. Its precise tripping characteristics help minimise the risk of damage to valuable equipment whilst maintaining dependable system operation.
With a 20 A rated current, 3P+N configuration and a 10 kA breaking capacity, the ABB S203MT-Z20NAH10 is ideally suited to industrial control panels, OEM machinery, railway applications and modular DIN rail distribution systems requiring high-performance circuit protection.
The ABB S203MT-Z20NAH10 combines delayed thermal overload protection with rapid magnetic short-circuit protection to safeguard sensitive electrical installations. Its Z characteristic enables fast fault clearance, helping protect electronic equipment whilst maintaining safe and reliable operation.
Designed for industrial automation, transportation and railway applications, the S200MT range provides dependable long-term performance, compact installation and compatibility with ABB System pro M Compact accessories for professional electrical installations.
| Current | 20 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | S200MT |
| Model | S203MT-Z20NAH10 |
| Product type | Miniature Circuit Breaker (MCB) |
| Rated current | 20 A |
| Tripping characteristic | Z |
| Number of poles | 3P+N |
| Protected poles | 3 |
| Rated operational voltage | Up to 440 V AC |
| Rated insulation voltage | 440 V |
| Rated impulse withstand voltage | 4 kV |
| Rated short-circuit breaking capacity | 10 kA |
| Frequency | 50 / 60 Hz |
| Current limiting class | 3 |
| Protection rating | IP20 |
| Mounting type | DIN rail |
| Mechanical endurance | 20,000 operating cycles |
It provides overload and short-circuit protection for sensitive electrical circuits in industrial, railway and automation applications.
The Z characteristic provides rapid magnetic tripping at relatively low fault currents, making it ideal for protecting sensitive electronic equipment and control systems.
The ABB S203MT-Z20NAH10 has a rated current of 20 A.
This miniature circuit breaker provides a rated short-circuit breaking capacity of 10 kA.
It is designed for DIN rail installation inside industrial control panels, distribution boards, OEM machinery and railway electrical systems.
ABB S200MT miniature circuit breakers are trusted by panel builders, railway engineers and industrial automation specialists for delivering dependable circuit protection, excellent reliability and long operational life in demanding low-voltage 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...