ABB S203M-K25NA 3P+N miniature circuit breaker with 25 A rated current, K curve tripping characteristic and 10 kA breaking capacity for professional circuit protection.
£201.80
The ABB S203M-K25NA is a high-quality 3P+N miniature circuit breaker (MCB) from the ABB System pro M compact S200M series. Designed for reliable protection against overloads and short circuits, it is suitable for residential, commercial and industrial electrical installations where dependable circuit protection is required.
This miniature circuit breaker uses ABB's current-limiting technology with a delayed thermal tripping mechanism for overload protection and an electromechanical tripping mechanism for short-circuit protection. Its K curve characteristic makes it especially suitable for circuits with higher inrush currents, helping reduce nuisance tripping while maintaining strong protection performance.
With a 25 A rated current, 3P+N configuration and 10 kA breaking capacity, the S203M-K25NA is ideal for three-phase electrical distribution, control panels, machinery and inductive loads requiring neutral switching. Its compact DIN rail design makes it easy to install in modern electrical panels and distribution boards.
Miniature circuit breakers protect electrical circuits by disconnecting the supply automatically when overloads or short circuits occur. The ABB S203M-K25NA combines thermal and magnetic tripping performance to protect cables, equipment and connected loads from electrical faults.
The K curve characteristic is designed for applications where temporary inrush currents can occur during normal operation. This makes the S203M-K25NA well suited to motor circuits, transformer supplies, industrial control panels and other inductive load applications.
| Current | 25 A |
|---|---|
| Phase | Single Phase |
| Manufacturer | ABB |
| Series | System pro M compact S200M |
| Model | S203M-K25NA |
| Product ID | 2CDS273103R0517 |
| EAN | 4016779659567 |
| Product type | Miniature circuit breaker (MCB) |
| Rated current | 25 A |
| Tripping characteristic | K |
| Number of poles | 3P+N |
| Protected poles | 3 |
| Rated operational voltage | 400 V AC |
| Rated insulation voltage | 440 V |
| Frequency | 50 / 60 Hz |
| Rated short-circuit breaking capacity | 10 kA |
| Rated ultimate short-circuit breaking capacity | 15 kA at 400 V AC |
| Protection rating | IP20 |
| Mounting type | DIN rail |
| Terminal type | Screw terminals |
| Built-in depth | approx. 69 mm |
| Dimensions (H × W × D) | approx. 88 × 70 × 69 mm |
| Weight | approx. 0.46 kg |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
The ABB S203M-K25NA is used to protect three-phase electrical circuits with neutral against overloads and short circuits.
This MCB has a 25 A rated current, making it suitable for industrial and commercial circuit protection applications.
A K curve breaker is designed for circuits with higher inrush currents, such as motors, transformers and other inductive loads.
The S203M-K25NA has a 3P+N configuration, with three protected poles and neutral switching.
The ABB S203M-K25NA is designed for DIN rail mounting in electrical distribution boards, control panels and machine cabinets.
ABB System pro M compact miniature circuit breakers are trusted by electrical contractors, panel builders and industrial engineers for reliable protection, compact installation and dependable performance in modern electrical systems.
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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...