ABB S203P-K25NA miniature circuit breaker from the S200P System pro M compact range, 3+NP configuration, K curve, 25 A rated current, designed for overload and short-circuit protection in electrical distribution systems.
The ABB S203P-K25NA is a high-performance miniature circuit breaker (MCB) from the ABB System pro M compact S200P series, designed to provide dependable overload and short-circuit protection in low-voltage electrical installations. With its K-curve tripping characteristic and 25 A rated current, it is particularly suited to circuits with higher inrush currents, including motors, transformers and inductive loads.
This ABB MCB features a 3+NP pole configuration, providing three protected poles with a neutral pole arrangement for three-phase plus neutral distribution systems. The S200P range is current limiting and uses delayed thermal tripping for overload protection alongside electromechanical tripping for short-circuit protection.
With compact DIN rail mounting, robust modular construction and high breaking capacity performance, the S203P-K25NA is ideal for professional distribution boards, control panels and industrial enclosures. It is also recognised under the manufacturer part number 2CDS283103R0517.
Miniature circuit breakers such as the ABB S203P-K25NA help protect electrical circuits by automatically disconnecting the supply during overload or short-circuit conditions. The delayed thermal trip responds to sustained overloads, while the electromechanical trip provides rapid response to short-circuit faults.
The K-curve characteristic is designed for applications where higher starting currents may occur during normal operation. This makes the S203P-K25NA suitable for motors, transformers, control circuits and other inductive loads where dependable protection and nuisance-trip resistance are important.
| Current | 25 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | S200P System pro M Compact |
| Model | S203P-K25NA |
| Manufacturer part number | 2CDS283103R0517 |
| Product type | Miniature circuit breaker |
| Rated current | 25 A |
| Tripping characteristic | K curve |
| Number of poles | 3+NP |
| Number of protected poles | 3 |
| Rated operational voltage | 400 V AC |
| Rated insulation voltage | 440 V |
| Frequency | 50 / 60 Hz |
| Rated short-circuit breaking capacity Icu | 25 kA at 400 V AC |
| Rated short-circuit breaking capacity Icn | 12.5 kA at 400 V AC |
| Current limiting class | 3 |
| Rated impulse withstand voltage | 4 kV |
| Mounting type | DIN rail mounting |
| Protection rating | IP20 |
| Dimensions (H × W × D) | approx. 88 × 70 × 69 mm |
| EAN | 4016779593366 |
The ABB S203P-K25NA is used to protect three-phase plus neutral electrical circuits against overloads and short circuits, particularly where higher inrush currents are present.
The S203P-K25NA has a rated current of 25 A.
A K-curve MCB is designed for circuits with higher starting currents, making it suitable for motors, transformers and inductive equipment.
The S203P-K25NA has a 3+NP pole configuration, providing three protected poles plus a neutral pole arrangement.
This MCB is typically installed on a DIN rail inside electrical distribution boards, switchgear assemblies, control panels and industrial enclosures.
ABB S200P miniature circuit breakers are widely used by electricians, panel builders and industrial engineers for dependable circuit protection, robust construction and professional electrical distribution performance.
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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...