ABB S203MT-K10NAH10 miniature circuit breaker with K characteristic, 10 A rated current and 3P+N configuration for industrial, railway and automation circuit protection.
The ABB S203MT-K10NAH10 is a robust three-pole plus neutral (3P+N) miniature circuit breaker (MCB) designed for dependable overload and short-circuit protection in industrial, railway and transportation electrical systems. As part of the specialist ABB S200MT series, it delivers reliable low-voltage circuit protection in compact DIN rail installations.
Featuring a K tripping characteristic, this miniature circuit breaker is well suited to circuits with higher inrush currents, including motors, transformers, solenoids and inductive loads. Its engineered tripping behaviour helps reduce nuisance tripping while maintaining effective protection for connected equipment.
With a 10 A rated current, 3P+N configuration and high short-circuit performance, the ABB S203MT-K10NAH10 is ideal for industrial control panels, OEM machinery, railway systems and modular electrical distribution boards requiring durable and reliable protection.
The ABB S203MT-K10NAH10 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 start-up or switching.
Designed for demanding electrical installations, the S200MT range offers compact modular construction, dependable performance and compatibility with industrial control panel layouts where space, reliability and safety are essential.
| Current | 10 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | S200MT |
| Model | S203MT-K10NAH10 |
| Product type | Miniature Circuit Breaker (MCB) |
| Rated current | 10 A |
| Tripping characteristic | K |
| Number of poles | 3P+N |
| Protected poles | 3 |
| Rated operational voltage | 440 V AC |
| Rated insulation voltage | 440 V |
| Rated impulse withstand voltage | 4 kV |
| Frequency | 50 / 60 Hz |
| Current limiting class | 3 |
| Protection rating | IP20 |
| Mounting type | DIN rail |
| Terminal type | Screw terminals |
| Dimensions (H × W × D) | approx. 88 × 70 × 69 mm |
| Weight | approx. 0.50 kg |
It is used to protect industrial, railway and automation circuits against overloads and short circuits, particularly where inductive loads and inrush currents are present.
The K characteristic is designed for circuits with higher inrush currents, making it suitable for motors, transformers, coils and other inductive loads.
The ABB S203MT-K10NAH10 has a rated current of 10 A.
This model has three protected poles plus a switched neutral, commonly described as a 3P+N configuration.
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 circuit 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...