ABB S203M-B20NA miniature circuit breaker from the System pro M compact S200M range featuring a 20 A rating, B curve tripping characteristic, 3+NP configuration and 10 kA breaking capacity for reliable circuit protection.
£166.30
The ABB S203M-B20NA is a high quality miniature circuit breaker (MCB) designed to provide reliable overload and short-circuit protection in residential, commercial and industrial electrical installations. As part of the professional ABB System pro M compact S200M series, it delivers dependable circuit protection for distribution boards, switchboards and control panels.
This miniature circuit breaker features a B curve tripping characteristic, making it suitable for standard electrical circuits with low inrush currents. It is commonly used for lighting circuits, socket outlet circuits and general power distribution where fast fault disconnection and reliable circuit protection are required.
With a rated current of 20 A, a 3+NP pole configuration and a breaking capacity of up to 10 kA, the S203M-B20NA is ideal for three-phase electrical systems requiring a switched neutral. Its compact DIN rail mounting design enables quick installation in modern modular electrical enclosures.
Miniature circuit breakers such as the ABB S203M-B20NA 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 use in electrical distribution boards, industrial panels and building services applications.
| Current | 20 A |
|---|---|
| Phase | Single Phase |
| Manufacturer | ABB |
| Series | System pro M compact S200M |
| Model | S203M-B20NA |
| Product type | Miniature circuit breaker |
| Product ID | 2CDS273103R0205 |
| EAN | 4016779549783 |
| Rated current | 20 A |
| Tripping characteristic | B curve |
| Pole configuration | 3+NP |
| Rated operational voltage | 230 / 400 V AC |
| Frequency | 50 / 60 Hz |
| Rated breaking capacity | 10 kA |
| Protection rating | IP20 |
| Mounting type | DIN rail mounting |
| Dimensions (H × W × D) | 88 × 70 × 69 mm |
| Weight | approx. 0.50 kg |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2 |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
The ABB S203M-B20NA is used to protect three-phase electrical circuits against overloads and short circuits in distribution boards, control panels and building installations.
This miniature circuit breaker has a rated current of 20 A.
A B curve MCB is designed for circuits with low inrush currents, such as lighting, socket outlet and general distribution circuits.
The S203M-B20NA 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 protection, compact installation and long-term performance in modern 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...