ABB S203-K3NA System pro M compact S200 miniature circuit breaker with 3P+N configuration, 3 A rated current, K tripping characteristic and 6 kA breaking capacity for industrial and commercial electrical protection.
£200.74
The ABB S203-K3NA is a high-quality 3P+N miniature circuit breaker (MCB) from the proven ABB System pro M compact S200 series. Engineered to provide dependable overload and short circuit protection, it is designed for industrial machinery, OEM equipment, automation systems and commercial electrical installations where reliable circuit protection is essential.
Featuring a K tripping characteristic and a 3 A rated current, the S203-K3NA is ideal for protecting circuits with elevated inrush currents. It is particularly well suited to motors, transformers, solenoids, contactors and other inductive loads where conventional MCBs may nuisance trip during start-up. Its advanced current-limiting design helps reduce fault energy and protect connected equipment.
With a 3P+N configuration and a 6 kA rated short circuit breaking capacity to IEC/EN 60898-1, the S203-K3NA delivers dependable protection while maintaining a compact DIN rail mounted format that integrates easily into modern switchboards and control panels.
The ABB S203-K3NA protects electrical circuits by combining delayed thermal overload protection with rapid electromagnetic short circuit protection. This dual protection mechanism helps minimise damage to cables, switchgear and connected equipment while maintaining reliable system operation.
Its K characteristic makes it particularly suitable for motors, transformers and inductive loads that generate higher starting currents. The compact modular design also allows easy integration into industrial control panels, automation systems and commercial distribution boards.
| Current | 3 A |
|---|---|
| Phase | Single Phase |
| Manufacturer | ABB |
| Series | System pro M compact S200 |
| Model | S203-K3NA |
| Product ID | 2CDS253103R0317 |
| Product type | Miniature Circuit Breaker (MCB) |
| Rated current | 3 A |
| Tripping characteristic | K |
| Number of poles | 3P+N |
| Rated operational voltage | Up to 440 V AC |
| Rated insulation voltage | 440 V |
| Rated impulse withstand voltage | 4 kV |
| Frequency | 50 / 60 Hz |
| Rated short circuit breaking capacity | 6 kA (IEC/EN 60898-1) |
| Current limiting class | 3 |
| Protection rating | IP20 |
| Mounting type | DIN rail |
| Dimensions (H × W × D) | approx. 88 × 70 × 69 mm |
| Weight | approx. 0.44 kg |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2, UL 1077 |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
The S203-K3NA protects three-phase electrical circuits against overloads and short circuits in industrial, commercial and OEM applications.
This miniature circuit breaker has a 3 A rated current.
A K curve MCB is designed for circuits with higher inrush currents, making it ideal for motors, transformers, contactors and other inductive equipment.
The S203-K3NA is a 3P+N device with three protected poles and a switched neutral.
Yes. It is designed for installation on standard DIN rails inside electrical panels and distribution boards.
ABB System pro M compact miniature circuit breakers are trusted by panel builders, electrical contractors and industrial engineers for dependable circuit protection, excellent reliability and long service life 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...