ABB S203P-K50NA System pro M compact miniature circuit breaker featuring a 3P+N configuration, 50 A rated current and K curve characteristic for industrial circuit protection.
The ABB S203P-K50NA is a high performance 3P+N miniature circuit breaker (MCB) from the trusted ABB System pro M compact S200P series. Designed for demanding commercial and industrial electrical installations, it provides reliable overload and short circuit protection for three-phase circuits while incorporating a switched neutral for enhanced safety and system protection.
Featuring a K tripping characteristic, the S203P-K50NA is particularly suitable for circuits with high inrush currents, making it an excellent choice for motors, transformers, control panels and industrial equipment. Its current limiting design helps minimise fault energy, reducing stress on connected equipment and improving overall system reliability.
With a 50 A rated current, 3P+N configuration and a breaking capacity of up to 25 kA, this DIN rail mounted circuit breaker delivers dependable protection across a wide range of industrial power distribution applications. The compact modular design also allows easy installation alongside ABB accessories such as auxiliary contacts, shunt trips and undervoltage releases.
The ABB S203P-K50NA protects electrical circuits using a combination of thermal overload protection and instantaneous magnetic short circuit protection. Its K characteristic provides higher magnetic trip thresholds than standard B or C curve devices, making it ideal for applications with elevated starting currents.
As part of ABB's premium System pro M compact range, the S203P-K50NA offers dependable operation, long service life and compatibility with a comprehensive range of modular accessories, making it suitable for modern industrial control panels and power distribution systems.
| Current | 50 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | System pro M compact S200P |
| Model | S203P-K50NA |
| Product ID | 2CDS283103R0577 |
| Product type | Miniature Circuit Breaker (MCB) |
| Rated current | 50 A |
| Poles | 3P+N |
| Trip characteristic | K Curve |
| Rated operational voltage | Up to 400 V AC |
| Frequency | 50 / 60 Hz |
| Breaking capacity | Up to 25 kA |
| Protection rating | IP20 |
| Mounting type | DIN rail |
| Terminal type | Screw terminals |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2, UL1077, CSA 22.2 No. 235 |
| Approximate dimensions (H × W × D) | 88 × 70 × 69 mm |
| Approximate weight | 0.56 kg |
The S203P-K50NA protects three-phase electrical circuits against overloads and short circuits in industrial and commercial installations.
A K curve miniature circuit breaker is designed for circuits with higher inrush currents, making it particularly suitable for motors, transformers and inductive loads.
This model features a 3P+N configuration, providing protection for three phases together with a switched neutral.
Yes. The ABB S200P range supports accessories including auxiliary contacts, signal contacts, shunt trips and undervoltage releases.
Yes. The S203P-K50NA is designed for quick installation onto standard DIN rails used in switchboards and industrial control panels.
ABB System pro M compact miniature circuit breakers are trusted by panel builders, OEM manufacturers and electrical engineers for dependable circuit protection, outstanding reliability and long service life in demanding industrial environments.
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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...