ABB 2CDS383103R0517 S303P-K25NA miniature circuit breaker with a 25 A rated current, 3P+N configuration, Type K tripping characteristic and 25 kA breaking capacity.
£213.42
The ABB 2CDS383103R0517, also identified as the S303P-K25NA, is a high-performance miniature circuit breaker (MCB) designed to protect industrial electrical circuits against overloads and short circuits. As part of the advanced ABB System pro M compact S300P series, it combines a high breaking capacity with dependable switching performance for demanding power distribution and control-panel applications.
This circuit breaker features a K tripping characteristic, making it particularly suitable for circuits containing equipment with elevated starting currents, including motors, transformers and inductive loads. Its thermal release provides overload protection, while the electromagnetic release enables rapid interruption during short-circuit conditions.
With a rated current of 25 A, a 3P+N configuration and a rated operational voltage of up to 415 V AC, the S303P-K25NA is well suited to three-phase industrial distribution systems. Its 25 kA breaking capacity, DIN-rail mounting and integrated trip indication support safe, efficient installation in machinery, switchboards and automation control panels.
Miniature circuit breakers such as the ABB S303P-K25NA automatically disconnect an electrical circuit when excessive current is caused by an overload or short circuit. This helps protect cables, machinery and electrical equipment from damage while reducing the risk of unsafe operating conditions.
The Type K operating characteristic is designed for equipment that may draw a substantial inrush current during start-up. This makes the breaker a practical choice for industrial motors, transformers, solenoids and similar inductive loads where a more sensitive tripping curve could cause unwanted interruptions.
| Current | 25 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | System pro M compact S300P |
| Model | S303P-K25NA |
| Product ID | 2CDS383103R0517 |
| EAN | 4016779076869 |
| Product type | Miniature circuit breaker |
| Rated current | 25 A |
| Number of poles | 3P+N |
| Tripping characteristic | Type K |
| Rated operational voltage | 415 V AC |
| Rated frequency | 50 / 60 Hz |
| Rated insulation voltage | 500 V AC |
| Ultimate breaking capacity | 25 kA |
| Service breaking capacity | 12.5 kA |
| Impulse withstand voltage | 6 kV |
| Protection rating | IP20; IP40 when installed in a suitable enclosure |
| Mounting type | 35 mm DIN rail |
| Terminal capacity | Up to 35 mm² solid or stranded conductor |
| Ambient operating temperature | -40 to +70 °C |
| Standards | IEC/EN 60947-2, IEC/EN 60898-1, UL 1077 and CSA 22.2 No. 235 |
| Approximate dimensions (H × W × D) | 88 × 70 × 69 mm |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
This miniature circuit breaker protects three-phase industrial circuits against overloads and short circuits, particularly where motors, transformers or other inductive loads are installed.
The ABB S303P-K25NA has a rated current of 25 A.
A Type K characteristic is designed to tolerate the elevated starting currents produced by inductive equipment while still providing reliable overload and short-circuit protection.
The circuit breaker has a rated ultimate short-circuit breaking capacity of 25 kA, making it suitable for demanding industrial installations.
The breaker is mounted on a standard 35 mm DIN rail inside a suitable electrical distribution board, control panel or machinery enclosure.
ABB System pro M compact S300P miniature circuit breakers provide dependable overload and short-circuit protection for industrial equipment, control panels and power distribution systems requiring high breaking performance.
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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...