Standard delivery
£8 ex VAT · free over £200UK parcel delivery is £8 ex VAT, or free on orders over £200 ex VAT.
Heavier items may be charged at a weight-based or pallet rate, shown at checkout.
ABB S203-B20 MCB – S200 – 3P – B – 20A
ABB S203-B20 three pole 20 A B curve miniature circuit breaker with 6 kA breaking capacity for residential, commercial and industrial circuit protection.
£42.95
Why Choose the ABB S203-B20 Miniature Circuit Breaker?
The ABB S203-B20 is a premium three-pole miniature circuit breaker (MCB) from the trusted ABB System pro M Compact S200 series. Designed to provide dependable overload and short circuit protection, it is ideal for residential, commercial and industrial electrical installations where safety, reliability and long service life are essential.
Featuring a B tripping characteristic, the S203-B20 is designed for circuits with low inrush currents, making it suitable for lighting, socket outlets, building services and general power distribution. Its delayed thermal and instantaneous magnetic trip mechanisms provide fast, reliable protection while ensuring stable operation under normal electrical loads.
With a 20 A rated current, three-pole configuration and a 6 kA short circuit breaking capacity, this DIN rail mounted miniature circuit breaker delivers dependable protection, straightforward installation and compliance with IEC/EN 60898-1, IEC/EN 60947-2 and UL 1077 standards.
Key Advantages
- Compact three-pole miniature circuit breaker for residential, commercial and industrial applications.
- B curve tripping characteristic for low inrush current circuits.
- 20 A rated current for dependable overload protection.
- 6 kA breaking capacity for reliable fault interruption.
- Thermal and magnetic trip mechanisms provide effective overload and short circuit protection.
- DIN rail mounting for quick installation inside switchboards and distribution boards.
Key Features
- ABB System pro M Compact S200 series.
- Three-pole (3P) configuration.
- 20 A rated current.
- B tripping characteristic.
- 6 kA rated short circuit breaking capacity.
- Suitable for AC/DC applications.
- Failsafe bi-directional cylinder-lift screw terminals.
- Compatible with ABB S200 auxiliary contacts and accessories.
Reliable Circuit Protection for Everyday Electrical Systems
The ABB S203-B20 combines delayed thermal overload protection with instantaneous magnetic short circuit protection to safeguard electrical circuits and connected equipment. This proven design provides dependable operation while reducing the risk of electrical faults causing equipment damage.
Its B characteristic makes it particularly suitable for circuits with low starting currents, including lighting installations, socket circuits and general power distribution. The compact housing enables efficient installation within switchboards, consumer units and industrial control panels.
Typical Applications
- Lighting circuits.
- Commercial distribution boards.
- Residential electrical installations.
- Control panels.
- Building services.
- General purpose power distribution.
Technical Specifications
Tick the specs you need, then view products that match.
| Certification | UL 1077 | |
|---|---|---|
| Phase | Three Phase | |
| Current | 20 A | |
| Poles | 3-pole | |
| Device Type | MCB | |
| Trip Curve | B curve | |
| Breaking Capacity | 6 kA | |
| Manufacturer | ABB | |
| Series | System pro M Compact S200 | |
| Model | S203-B20 | |
| Product type | Miniature Circuit Breaker (MCB) | |
| Rated current | 20 A | |
| Number of poles | 3 | |
| Tripping characteristic | B | |
| Rated operational voltage | 400 V AC | |
| Maximum operational voltage | 440 V AC | |
| Voltage type | AC/DC | |
| Rated frequency | 50 / 60 Hz | |
| Breaking capacity | 6 kA | |
| Protection rating | IP20 | |
| Mounting type | DIN rail | |
| Terminal type | Failsafe bi-directional cylinder-lift screw terminals | |
| Dimensions (H × W × D) | 88 × 52.5 × 69 mm | |
| Weight | approx. 0.345 kg | |
| HS Code | 85362010 | |
| Country of Manufacture | Germany |
Frequently Asked Questions
What is the ABB S203-B20 used for?
The ABB S203-B20 protects three-phase electrical circuits against overloads and short circuits in residential, commercial and industrial installations.
What does the B tripping characteristic mean?
A B curve circuit breaker is intended for circuits with low inrush currents, making it suitable for lighting, socket outlets and standard electrical distribution.
How many poles does the ABB S203-B20 have?
This model features a three-pole (3P) configuration for protecting three-phase electrical systems.
What is the breaking capacity of this MCB?
The ABB S203-B20 has a rated short circuit breaking capacity of 6 kA.
How is the ABB S203-B20 installed?
The circuit breaker is designed for installation onto a standard DIN rail inside electrical distribution boards and industrial control panels.
Trusted by Electrical Professionals Worldwide
ABB System pro M Compact miniature circuit breakers are trusted by electricians, panel builders and industrial engineers for dependable circuit protection, consistent performance and long operational life.
