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ABB S203M-B50 MCB – S200M – 3P – B – 50A
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.
£60.97
Why Choose the ABB S203M-B50 Miniature Circuit Breaker?
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.
Key Advantages
- Compact 3-pole miniature circuit breaker for reliable circuit protection.
- 50 A current rating for higher load electrical circuits.
- B curve tripping characteristic for general purpose applications.
- 10 kA short circuit breaking capacity at 230 / 400 V AC.
- Thermal overload and electromechanical short circuit protection.
- DIN rail mounting for quick installation in distribution boards and control panels.
Key Features
- ABB System pro M compact S200M series.
- 3-pole (3P) miniature circuit breaker.
- 50 A rated current.
- B curve tripping characteristic.
- 10 kA rated breaking capacity.
- Current limiting design for enhanced fault protection.
- Complies with IEC/EN 60898-1 and IEC/EN 60947-2.
- Compatible with ABB auxiliary contacts, signalling devices and accessories.
Reliable Protection for Electrical Distribution Systems
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.
Typical Applications
- Commercial electrical distribution boards.
- Industrial control panels.
- Three-phase power distribution systems.
- Machine building and automation equipment.
- OEM electrical assemblies.
- Building services and infrastructure installations.
Technical Specifications
Tick the specs you need, then view products that match.
| Phase | Three Phase | |
|---|---|---|
| Current | 50 A | |
| Poles | 3-pole | |
| Device Type | MCB | |
| Trip Curve | B curve | |
| Breaking Capacity | 10 kA | |
| 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 |
Frequently Asked Questions
What is the ABB S203M-B50 used for?
The ABB S203M-B50 protects three-phase electrical circuits against overloads and short circuits in commercial, industrial and residential installations.
What current rating does the S203M-B50 have?
The S203M-B50 has a 50 A rated current.
What does the B curve tripping characteristic mean?
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.
How many poles does the ABB S203M-B50 have?
The S203M-B50 is a 3-pole miniature circuit breaker designed to protect and switch three conductors simultaneously.
Where is the S203M-B50 typically installed?
It is designed for installation on standard DIN rails inside distribution boards, industrial control panels and electrical enclosures.
Trusted by Electrical Professionals Worldwide
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.
