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ABB S203-B40NA MCB – S200 – 3P+N – B – 40A
ABB S203-B40NA System pro M Compact miniature circuit breaker with 3P+N configuration, 40 A rated current, B tripping characteristic and 6 kA breaking capacity for residential, commercial and industrial circuit protection.
£120.74
Why Choose the ABB S203-B40NA Miniature Circuit Breaker?
The ABB S203-B40NA is a premium 3P+N miniature circuit breaker (MCB) from the trusted ABB System pro M Compact S200 series, engineered to provide dependable overload and short circuit protection for residential, commercial and industrial electrical installations. Featuring a B tripping characteristic, this breaker is specifically designed for circuits with low inrush currents, making it ideal for lighting circuits, socket outlets and general-purpose power distribution.
Built using ABB's advanced thermal and electromagnetic tripping technology, the S203-B40NA delivers reliable circuit protection with excellent current limiting performance. Its compact DIN rail mounted design enables quick installation in switchboards, distribution boards and control panels while remaining fully compatible with ABB's extensive range of S200 accessories.
With a 40 A rated current, 3P+N configuration and a 6 kA breaking capacity, the ABB S203-B40NA provides dependable protection for three-phase electrical systems requiring a switched neutral, ensuring safe and reliable operation across residential, commercial and industrial environments.
Key Advantages
- 3P+N miniature circuit breaker for three-phase systems with switched neutral.
- 40 A rated current for general electrical distribution.
- B characteristic trip curve for circuits with low inrush currents.
- 6 kA breaking capacity for dependable short circuit protection.
- Compact DIN rail mounting for straightforward installation.
- Compatible with ABB S200 series accessories for enhanced system flexibility.
Key Features
- ABB System pro M Compact S200 series.
- Model: S203-B40NA.
- Rated current: 40 A.
- 3P+N pole configuration.
- B tripping characteristic.
- 6 kA rated short circuit capacity.
- Thermal overload and electromagnetic short circuit protection.
- Current limiting design.
- DIN rail mounting.
Reliable Protection for Electrical Distribution Systems
The ABB S203-B40NA automatically disconnects electrical circuits during overload and short circuit conditions, helping protect wiring, distribution equipment and connected devices from damage while maintaining electrical safety and installation reliability.
Its B characteristic provides rapid tripping for circuits with low inrush currents, making it particularly suitable for lighting circuits, socket outlets, office installations and general-purpose commercial power distribution.
Typical Applications
- Commercial distribution boards.
- Industrial switchboards.
- Lighting circuits.
- Socket outlet circuits.
- Electrical control panels.
- General-purpose three-phase power distribution.
Technical Specifications
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| Phase | Three Phase | |
|---|---|---|
| Current | 40 A | |
| Poles | 3-pole + N | |
| Device Type | MCB | |
| Trip Curve | B curve | |
| Breaking Capacity | 6 kA | |
| Manufacturer | ABB | |
| Series | System pro M Compact S200 | |
| Model | S203-B40NA | |
| Product ID | 2CDS253103R0405 | |
| Product type | Miniature Circuit Breaker (MCB) | |
| Rated current | 40 A | |
| Tripping characteristic | B | |
| Number of poles | 3P+N | |
| Rated operational voltage | 400 V AC | |
| Maximum operational voltage | 440 V AC | |
| Rated frequency | 50 / 60 Hz | |
| Rated short circuit capacity | 6 kA | |
| Energy limiting class | 3 | |
| Mounting type | DIN rail | |
| Dimensions (H × W × D) | 88 × 70 × 69 mm | |
| Weight | Approx. 0.50 kg | |
| Protection rating | IP20 (IP40 when installed in a suitable enclosure) | |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2, UL 1077 | |
| HS Code | 85362010 | |
| Country of Manufacture | Germany |
Frequently Asked Questions
What is the ABB S203-B40NA used for?
The ABB S203-B40NA protects three-phase electrical circuits with a neutral against overloads and short circuits in residential, commercial and industrial installations.
What does the B trip characteristic mean?
The B characteristic is designed for circuits with low inrush currents, making it ideal for lighting, socket outlets and general electrical distribution.
What is the rated current of this breaker?
This miniature circuit breaker has a 40 A rated current.
How is the S203-B40NA installed?
The breaker mounts directly onto a standard 35 mm DIN rail inside switchboards, distribution boards and control panels.
Can ABB accessories be fitted?
Yes. The ABB S200 range supports auxiliary contacts, shunt trips, undervoltage releases, motor operators and other compatible accessories.
Trusted by Electrical Professionals Worldwide
ABB System pro M Compact miniature circuit breakers are trusted by electricians, panel builders and industrial engineers worldwide for dependable circuit protection, outstanding quality and long operational life.
