ABB S203M-B50 miniature circuit breaker from the System pro M compact S200M range. A 3-pole 50 A B curve MCB with 10 kA breaking capacity for reliable overload and short circuit protection.
£110.86
The ABB S203M-B50 is a robust and reliable 3-pole miniature circuit breaker (MCB) designed to protect electrical circuits against overloads and short circuits. As part of the ABB System pro M compact S200M series, it delivers dependable circuit protection for residential, commercial and industrial low voltage installations.
Featuring a B curve tripping characteristic, the S203M-B50 is ideal for general purpose circuits with relatively low inrush currents. Its advanced current limiting design combines delayed thermal tripping for overload protection with electromechanical tripping for short circuit protection, helping maximise safety while reducing stress on connected equipment.
With a 50 A rated current, 3-pole configuration and 10 kA breaking capacity, this miniature circuit breaker is perfectly suited to DIN rail mounted distribution boards, industrial control panels and OEM electrical systems requiring dependable circuit protection.
Miniature circuit breakers such as the ABB S203M-B50 automatically disconnect the electrical supply when overload or short circuit faults occur. This protects wiring, connected equipment and downstream circuits while improving the safety and reliability of low voltage electrical installations.
The ABB S200M range is trusted by panel builders, electrical contractors and industrial engineers because it combines compact dimensions, excellent breaking performance and long service life with compatibility across a wide range of ABB accessories.
| Current | 50 A |
|---|---|
| Phase | Single Phase |
| Manufacturer | ABB |
| Series | System pro M compact S200M |
| Model | S203M-B50 |
| Product type | Miniature Circuit Breaker (MCB) |
| Product ID | 2CDS273001R0505 |
| EAN | 4016779543873 |
| Current rating | 50 A |
| Number of poles | 3P |
| Tripping characteristic | B |
| Rated operational voltage | 230 / 400 V AC |
| Rated insulation voltage | 440 V AC |
| Rated impulse withstand voltage | 4 kV |
| Rated frequency | 50 / 60 Hz |
| Breaking capacity | 10 kA |
| Protection rating | IP20 (IP40 when installed in an enclosure) |
| Mounting type | DIN rail |
| Terminal type | Screw terminals |
| Operating temperature | -25 to 55 °C |
| Dimensions (H × W × D) | approx. 88 × 52.5 × 76 mm |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
The ABB S203M-B50 protects three-phase electrical circuits against overloads and short circuits in commercial, industrial and residential installations.
The S203M-B50 has a 50 A rated current.
A B curve miniature circuit breaker trips quickly at relatively low fault currents, making it suitable for general purpose electrical circuits with modest inrush currents.
The S203M-B50 is a 3-pole miniature circuit breaker designed to protect and switch three conductors simultaneously.
It is designed for installation on standard DIN rails inside distribution boards, industrial control panels and electrical enclosures.
ABB System pro M compact miniature circuit breakers are trusted worldwide by contractors, panel builders and industrial engineers for dependable circuit protection, consistent performance and long-term reliability.
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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...