ABB S203P-B20NA System pro M compact miniature circuit breaker featuring 3P+N configuration, 20 A rated current, B curve tripping characteristic and 25 kA breaking capacity for industrial and commercial electrical protection.
The ABB S203P-B20NA is a high-performance 3P+N miniature circuit breaker (MCB) from the trusted ABB System pro M compact S200P series. Designed to provide dependable overload and short circuit protection, it delivers exceptional reliability for commercial, industrial and OEM electrical installations where higher fault-breaking performance is required.
Featuring a B tripping characteristic and a 20 A rated current, the S203P-B20NA protects electrical circuits against overload and fault currents while maintaining excellent operational safety. Its advanced current-limiting design reduces thermal and mechanical stress during fault conditions, helping to protect connected equipment and extend system life.
With a 25 kA breaking capacity at 230/400 V AC, this four-pole device (3 protected poles plus neutral) is well suited to demanding industrial distribution systems, machinery, panel building and commercial switchboards. The compact DIN rail mounted design allows straightforward installation while remaining compatible with ABB's extensive range of accessories.
The ABB S200P range combines thermal overload protection with instantaneous electromagnetic short circuit protection, delivering fast fault clearance and helping minimise damage to cables, switchgear and connected equipment. The current limiting design reduces let-through energy, improving overall system safety.
Designed for industrial, commercial and OEM applications, the S203P-B20NA provides dependable performance in electrical distribution panels, machine control systems and automation equipment. It also supports a wide range of ABB accessories for enhanced monitoring and remote operation.
| Current | 20 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | System pro M compact S200P |
| Model | S203P-B20NA |
| Product type | Miniature Circuit Breaker (MCB) |
| Product ID | 2CDS283103R0205 |
| Rated current | 20 A |
| Tripping characteristic | B |
| Number of poles | 3P+N |
| Rated voltage | 230/400 V AC |
| Frequency | 50 / 60 Hz |
| Breaking capacity | Up to 25 kA |
| Protection rating | IP20 |
| Mounting type | DIN rail |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2, UL 1077, CSA 22.2 No.235 |
| Dimensions (H × W × D) | Approx. 88 × 70 × 69 mm |
| Weight | Approx. 0.56 kg |
The S203P-B20NA protects three-phase electrical circuits against overloads and short circuits in commercial, industrial and OEM applications.
This miniature circuit breaker has a 20 A rated current.
A B curve MCB is designed to trip quickly under relatively low overcurrent conditions, making it suitable for circuits with low inrush currents such as lighting and general power distribution.
The S203P-B20NA is a 3P+N device with three protected poles and a switched neutral.
Yes. The S200P range supports a wide selection of ABB auxiliary contacts, shunt trips, undervoltage releases and other accessories.
ABB System pro M compact miniature circuit breakers are trusted by electrical contractors, panel builders and industrial engineers for delivering reliable protection, excellent performance and long-term durability in demanding electrical installations.
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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...