ABB S203M-B40 miniature circuit breaker from the System pro M compact S200M range. A 3-pole 40 A B curve MCB with 10 kA breaking capacity for reliable overload and short circuit protection.
£105.65
The ABB S203M-B40 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 low voltage circuit protection for commercial, industrial and residential electrical installations.
Featuring a B curve tripping characteristic, the S203M-B40 is suitable for general purpose circuits where relatively low inrush currents are expected. Its current limiting design combines delayed thermal tripping for overload protection with electromechanical tripping for short circuit protection, helping maintain safe and consistent circuit operation.
With a 40 A rated current, 3-pole configuration and 10 kA breaking capacity, this miniature circuit breaker is ideal for DIN rail mounted distribution boards, control panels and electrical enclosures where robust, compact and high quality circuit protection is required.
Miniature circuit breakers such as the ABB S203M-B40 automatically disconnect the supply when overload or short circuit faults are detected. This helps protect cables, connected equipment and downstream circuits from damage while supporting safer operation in low voltage installations.
The ABB S200M range is widely used by electrical contractors, panel builders and industrial engineers because it combines compact DIN rail mounting, high breaking performance and dependable switching for demanding electrical environments.
| Current | 40 A |
|---|---|
| Phase | Single Phase |
| Manufacturer | ABB |
| Series | System pro M compact S200M |
| Model | S203M-B40 |
| Product type | Miniature Circuit Breaker (MCB) |
| Product ID | 2CDS273001R0405 |
| Current rating | 40 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 × 76 mm |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
The ABB S203M-B40 is used to protect electrical circuits against overloads and short circuits in residential, commercial and industrial low voltage installations.
The S203M-B40 has a 40 A rated current.
A B curve MCB is designed to trip at lower short circuit current levels, making it suitable for general purpose circuits with relatively low inrush currents.
The S203M-B40 is a 3-pole miniature circuit breaker, allowing three conductors to be switched and protected.
It is typically installed on a DIN rail inside electrical distribution boards, control panels and industrial enclosures.
ABB System pro M compact miniature circuit breakers are trusted by contractors, engineers and panel builders for reliable circuit protection, compact installation and consistent performance across demanding electrical 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...