ABB S203MT-K6H01 three pole 6A K characteristic miniature circuit breaker designed for railway, traction and industrial electrical protection with 10 kA short circuit capacity.
The ABB S203MT-K6H01 is a high quality 3-pole miniature circuit breaker (MCB) designed for reliable overload and short circuit protection in railway, traction and industrial electrical systems. Part of the trusted ABB S200MT miniature circuit breaker series, it provides dependable circuit protection for demanding applications where compact installation, robust performance and long service life are essential.
With a K characteristic tripping curve, the S203MT-K6H01 is suitable for circuits with higher inrush currents, including motors, transformers, solenoids and inductive loads. Its thermal and electromagnetic trip mechanisms help protect electrical equipment against overloads and fault currents while supporting reliable operation in industrial control systems.
Featuring a 6 A rated current, 3-pole configuration and 10 kA rated short circuit capacity, the ABB S203MT-K6H01 is ideal for railway vehicles, control panels, OEM machinery and industrial distribution systems requiring dependable three-phase circuit protection.
Miniature circuit breakers such as the ABB S203MT-K6H01 protect electrical installations by disconnecting circuits during overload or short circuit conditions. The delayed thermal trip mechanism responds to overloads, while the electromagnetic trip mechanism reacts quickly to short circuit faults.
The K curve characteristic makes this MCB a practical choice for circuits where normal operation may involve short-duration inrush currents. This helps deliver dependable protection while reducing the risk of nuisance tripping in suitable inductive load applications.
| Current | 3 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | S200MT |
| Model | S203MT-K6H01 |
| Alternative model | S203MT-K6 |
| Product type | Miniature Circuit Breaker (MCB) |
| Rated current | 6 A |
| Tripping characteristic | K |
| Number of poles | 3 |
| Rated operational voltage | Up to 400 V AC |
| Rated insulation voltage | 440 V |
| Frequency | 50 / 60 Hz |
| Rated short circuit capacity | 10 kA |
| Rated ultimate breaking capacity (Icu) | 15 kA |
| Energy limiting class | 3 |
| Protection rating | IP20 |
| Mounting type | DIN rail |
| Dimensions (H × W × D) | approx. 88 × 52.5 × 69 mm |
| Weight | approx. 0.375 kg |
The ABB S203MT-K6H01 is used to protect three-phase electrical circuits against overloads and short circuits in railway, industrial and automation applications.
This miniature circuit breaker has a 6 A rated current.
The K characteristic is designed for circuits with higher inrush currents, making it suitable for inductive loads such as motors, transformers and solenoids.
The ABB S203MT-K6H01 has a 3-pole (3P) configuration for three-phase circuit protection.
It is designed for standard DIN rail mounting inside electrical distribution boards, control panels and machine cabinets.
ABB S200MT miniature circuit breakers are widely used by panel builders, OEMs and railway engineers for reliable protection of electrical circuits in demanding transport and industrial environments.
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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...