ABB S203M-K3NA miniature circuit breaker from the System pro M compact S200M range featuring a 3 A rating, K curve tripping characteristic, 3+NP configuration and up to 10 kA breaking capacity for reliable circuit protection.
£187.71
The ABB S203M-K3NA is a professional miniature circuit breaker (MCB) designed to provide reliable overload and short-circuit protection for commercial, industrial and control panel applications. As part of the trusted ABB System pro M compact S200M series, it delivers dependable current-limiting protection for modern electrical installations.
This miniature circuit breaker features a K curve tripping characteristic, making it suitable for circuits with higher inrush currents than standard B or C curve applications. It is commonly used for inductive loads, control circuits, transformers and equipment where nuisance tripping must be reduced while maintaining safe fault protection.
With a rated current of 3 A, a 3+NP pole configuration and a breaking capacity of up to 10 kA at 230 / 400 V AC, the S203M-K3NA is ideal for specialised three-phase circuit protection applications requiring neutral switching. Its compact DIN rail format supports fast installation in modular electrical enclosures.
Miniature circuit breakers such as the ABB S203M-K3NA automatically disconnect electrical circuits during overload or short-circuit conditions. This helps protect cables, equipment and connected loads while supporting safe and compliant electrical installation design.
The ABB S200M range is engineered for professional installations requiring compact dimensions, dependable performance and high breaking capacity. Its modular format makes it suitable for electrical distribution boards, industrial control panels and OEM equipment where reliable protection is essential.
| Current | 3 A |
|---|---|
| Phase | Single Phase |
| Manufacturer | ABB |
| Series | System pro M compact S200M |
| Model | S203M-K3NA |
| Product type | Miniature circuit breaker |
| Product ID | 2CDS273103R0317 |
| EAN | 4016779659482 |
| Rated current | 3 A |
| Tripping characteristic | K curve |
| Pole configuration | 3+NP |
| Rated operational voltage | 230 / 400 V AC |
| Frequency | 50 / 60 Hz |
| Rated breaking capacity | up to 10 kA |
| Protection rating | IP20 |
| Mounting type | DIN rail mounting |
| Dimensions (H × W × D) | approx. 88 × 70 × 69 mm |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2 |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
The ABB S203M-K3NA is used to protect low-current three-phase electrical circuits against overloads and short circuits in distribution boards, control panels and industrial installations.
This miniature circuit breaker has a rated current of 3 A.
A K curve MCB is designed for circuits with higher inrush currents, making it suitable for inductive loads, transformers and selected control applications.
The S203M-K3NA provides three protected phase poles together with a neutral pole, making it suitable for three-phase systems requiring neutral switching.
It is designed for DIN rail installation inside distribution boards, switchboards and electrical control panels.
ABB System pro M compact miniature circuit breakers are trusted by electricians, panel builders and industrial engineers for reliable circuit protection, compact installation and long-term performance in demanding electrical 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...