ABB S203MT-K50NAH10 miniature circuit breaker with K characteristic, 50 A rated current, 3P+N configuration and 10 kA breaking capacity for industrial, railway and automation circuit protection.
The ABB S203MT-K50NAH10 is a robust three-pole plus neutral (3P+N) miniature circuit breaker (MCB) designed to provide dependable overload and short-circuit protection for demanding industrial, railway and transportation electrical systems. As part of the specialist ABB S200MT miniature circuit breaker series, it delivers reliable protection for low-voltage installations where safety, durability and compact installation are essential.
Featuring a K tripping characteristic, this miniature circuit breaker is particularly suited to circuits with higher inrush currents, including motors, transformers, contactors, coils and other inductive loads. Its tripping behaviour helps reduce nuisance interruptions while maintaining effective protection for connected equipment, wiring and distribution circuits.
With a 50 A rated current, 3P+N configuration and 10 kA short-circuit breaking capacity, the ABB S203MT-K50NAH10 is ideal for DIN rail mounted industrial control panels, OEM machinery, railway electrical systems and modular distribution boards requiring compact, high-current circuit protection.
The ABB S203MT-K50NAH10 combines thermal overload protection with magnetic short-circuit protection to help safeguard cables, circuits and connected electrical equipment. Its K characteristic supports reliable operation where temporary inrush currents are expected during equipment start-up, transformer energisation or motor switching.
Designed for demanding industrial and transportation environments, the ABB S200MT range provides compact modular construction, dependable circuit protection and straightforward integration into professional electrical panel layouts.
| Current | 50 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | S200MT |
| Model | S203MT-K50NAH10 |
| Product type | Miniature Circuit Breaker (MCB) |
| Rated current | 50 A |
| Tripping characteristic | K |
| 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 |
| Terminal type | Screw terminals |
It is used to protect industrial, railway and automation circuits against overloads and short circuits, particularly where inductive loads and higher inrush currents are present.
The K characteristic is designed for circuits with higher inrush currents, making it suitable for motors, transformers, contactors and other inductive loads.
The ABB S203MT-K50NAH10 has a rated current of 50 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, railway systems and OEM machinery.
ABB S200MT miniature circuit breakers are trusted by panel builders, railway engineers and industrial automation specialists for dependable protection, compact installation and long service life in demanding low-voltage systems.
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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...