ABB S203MT-K4NAH10 miniature circuit breaker with K characteristic, 4 A rated current, 3P+N configuration and 10 kA breaking capacity for industrial, railway and control circuit protection.
The ABB S203MT-K4NAH10 is a robust three-pole plus neutral (3P+N) miniature circuit breaker (MCB) designed for reliable circuit protection in industrial, railway and traction applications. As part of the specialist ABB S200MT miniature circuit breaker series, it provides dependable protection against overloads and short circuits in demanding electrical installations.
With a K tripping characteristic, the S203MT-K4NAH10 is suited to circuits with higher inrush currents, such as control transformers, motors, solenoids and inductive loads. Its delayed magnetic tripping behaviour helps prevent unwanted nuisance tripping while maintaining effective protection for cables and equipment.
Rated at 4 A with a 10 kA breaking capacity, this ABB MCB is ideal for compact DIN rail distribution boards, industrial control panels, transportation systems and OEM machinery where reliable low-voltage protection is essential.
The ABB S203MT-K4NAH10 protects electrical circuits by combining delayed thermal overload protection with electromechanical short-circuit tripping. This helps maintain safe operation while reducing the risk of equipment damage caused by overcurrent conditions.
Its K characteristic makes it particularly useful for circuits where temporary inrush currents are expected. This allows the breaker to support reliable operation of control transformers, coils and inductive devices without unnecessary interruptions.
| Current | 4 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | S200MT |
| Model | S203MT-K4NAH10 |
| Product type | Miniature Circuit Breaker (MCB) |
| Rated current | 4 A |
| Tripping characteristic | K |
| Number of poles | 3P+N |
| Protected poles | 3 |
| Rated short-circuit breaking capacity | 10 kA |
| Frequency | 50 / 60 Hz |
| Mounting type | DIN rail |
| Terminal type | Screw terminals |
| Product range | System pro M compact |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2 |
It is used to protect three-phase electrical circuits with a switched neutral against overloads and short circuits in industrial, railway and automation applications.
The K characteristic is designed for circuits with higher inrush currents, making it suitable for inductive loads such as transformers, coils and motor control circuits.
The ABB S203MT-K4NAH10 has a rated current of 4 A.
This miniature circuit breaker has a rated short-circuit breaking capacity of 10 kA.
It is designed for DIN rail mounting inside electrical distribution boards, control cabinets and industrial panel assemblies.
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...