ABB S203M-B63 miniature circuit breaker from the System pro M compact S200M range. A 3-pole 63 A B curve MCB with 10 kA breaking capacity for reliable overload and short circuit protection.
£113.09
The ABB S203M-B63 is a compact 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 provides dependable circuit protection for commercial, industrial and residential low voltage installations.
Featuring a B curve tripping characteristic, the S203M-B63 is suitable for general purpose circuits where relatively low inrush currents are expected. Its current limiting design uses delayed thermal tripping for overload protection and electromechanical tripping for short circuit protection, helping support safe and consistent operation.
With a 63 A rated current, 3-pole configuration and 10 kA breaking capacity, this miniature circuit breaker is ideal for DIN rail mounted distribution boards, industrial control panels and electrical enclosures requiring robust circuit protection in a compact modular format.
Miniature circuit breakers such as the ABB S203M-B63 automatically disconnect the electrical supply when overload or short circuit faults are detected. This helps protect cables, connected equipment and downstream circuits from damage while improving the safety and reliability of low voltage installations.
The ABB S200M range is trusted by panel builders, electrical contractors and industrial engineers because it combines compact dimensions, strong breaking performance and long service life with compatibility across ABB modular protection accessories.
| Current | 63 A |
|---|---|
| Phase | Single Phase |
| Manufacturer | ABB |
| Series | System pro M compact S200M |
| Model | S203M-B63 |
| Product type | Miniature Circuit Breaker (MCB) |
| Product ID | 2CDS273001R0635 |
| EAN | 4016779543880 |
| Current rating | 63 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 |
| Mounting type | DIN rail |
| Terminal type | Screw terminals |
| Operating temperature | -25 to 55 °C |
| Dimensions (H × W × D) | approx. 88 × 52.5 × 69 mm |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
The ABB S203M-B63 protects three-phase electrical circuits against overloads and short circuits in commercial, industrial and residential installations.
The S203M-B63 has a 63 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-B63 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...