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ABB S203M-B63NA MCB – S200M – 3P+N – B – 63A
ABB S203M-B63NA miniature circuit breaker, a 63 A 3P+N B curve MCB from the System pro M Compact S200M series for industrial and commercial circuit protection.
£96.87
Why Choose the ABB S203M-B63NA Miniature Circuit Breaker?
The ABB S203M-B63NA is a high quality miniature circuit breaker (MCB) from the trusted ABB System pro M Compact S200M series, designed to provide reliable overload and short circuit protection in industrial, commercial and electrical distribution applications. Featuring a B characteristic trip curve, it is suitable for circuits with low inrush currents and standard resistive loads.
This miniature circuit breaker uses two tripping mechanisms: a delayed thermal mechanism for overload protection and an electromechanical mechanism for short circuit protection. The S200M range is engineered for compact installation, dependable performance and compatibility with ABB modular DIN rail accessories.
With a rated current of 63 A, a 3P+N configuration and a 10 kA breaking capacity, the S203M-B63NA is ideal for protecting three-phase distribution circuits where neutral switching is required.
Key Advantages
- Reliable miniature circuit breaker for industrial and commercial protection.
- 63 A rated current for higher load distribution circuits.
- B characteristic trip curve for standard circuits with low inrush currents.
- 3P+N configuration for three protected phase poles with switched neutral.
- 10 kA breaking capacity for dependable short circuit protection.
- DIN rail mounting for fast installation in control panels and distribution boards.
Key Features
- ABB System pro M Compact S200M series.
- 63 A rated current.
- B curve tripping characteristic.
- 3P+N pole configuration.
- 10 kA rated short circuit breaking capacity.
- Thermal overload and electromechanical short circuit protection.
- Current limiting design for enhanced circuit protection.
- Compatible with ABB auxiliary and signalling accessories.
Reliable Protection for Electrical Distribution Circuits
Miniature circuit breakers such as the ABB S203M-B63NA help protect electrical circuits by disconnecting the supply when overloads or short circuits occur. The thermal trip responds to sustained overload conditions, while the electromechanical trip reacts quickly to short circuit faults.
The B curve characteristic is intended for circuits with low inrush currents, making this device suitable for standard lighting, heating and general distribution applications where fast fault response is required.
Typical Applications
- Commercial distribution boards.
- Industrial control panels.
- General three-phase power distribution.
- Lighting and heating circuits.
- Resistive load protection.
- Electrical installations requiring neutral switching.
Technical Specifications
Tick the specs you need, then view products that match.
| Phase | Three Phase | |
|---|---|---|
| Current | 63 A | |
| Poles | 3-pole + N | |
| Device Type | MCB | |
| Trip Curve | B curve | |
| Breaking Capacity | 10 kA | |
| Manufacturer | ABB | |
| Series | System pro M Compact S200M | |
| Model | S203M-B63NA | |
| Product type | Miniature circuit breaker (MCB) | |
| Rated current | 63 A | |
| Number of protected poles | 3 | |
| Neutral pole | Switched neutral | |
| Pole configuration | 3P+N | |
| Trip characteristic | B | |
| Rated operational voltage | 400 V AC | |
| Rated insulation voltage | 440 V | |
| Rated impulse withstand voltage | 4 kV | |
| Frequency | 50 / 60 Hz | |
| Breaking capacity | 10 kA | |
| Protection rating | IP20 | |
| Mounting type | DIN rail | |
| Width | 4 modular spacings | |
| Built-in depth | approx. 69 mm | |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2 | |
| HS Code | 85362010 | |
| Country of Manufacture | Germany |
Frequently Asked Questions
What is the ABB S203M-B63NA used for?
It is used to provide overload and short circuit protection for three-phase electrical circuits where neutral switching is required.
What does the B trip characteristic mean?
The B curve is designed for circuits with low inrush currents, such as standard lighting, heating and general distribution loads.
What is the rated current of this MCB?
The ABB S203M-B63NA has a rated current of 63 A.
What does 3P+N mean?
3P+N means the device has three protected phase poles together with a switched neutral pole.
How is the ABB S203M-B63NA installed?
It is designed for DIN rail mounting inside electrical distribution boards, control panels and industrial enclosures.
Trusted by Electrical Professionals Worldwide
ABB System pro M Compact miniature circuit breakers are widely used by electrical contractors, panel builders and machine manufacturers for reliable protection across industrial, commercial and distribution applications.
