ABB S303P-K4 miniature circuit breaker featuring a 3-pole design, 4 A current rating and K tripping characteristic for industrial overload and short-circuit protection.
£189.31
The ABB S303P-K4 (2CDS383001R0337) is a high-performance three-pole miniature circuit breaker (MCB) engineered to provide dependable protection against overloads and short circuits in demanding industrial electrical installations. As part of the trusted ABB S300P series, it is designed for applications requiring exceptional breaking capacity and reliable circuit protection.
Manufactured to international IEC and UL standards, the S303P-K4 delivers outstanding electrical performance while ensuring maximum safety for switchgear assemblies, industrial control panels and power distribution systems. Its robust construction, compact DIN rail design and clear contact position indication simplify installation and maintenance.
With a 4 A current rating, K tripping characteristic and a 100 kA ultimate short-circuit breaking capacity (IEC 60947-2), this miniature circuit breaker is ideally suited to industrial machinery, motor circuits and installations with high inrush currents.
The ABB S303P-K4 miniature circuit breaker is designed to disconnect electrical circuits automatically when overload or short-circuit conditions occur. This helps protect electrical equipment, minimise downtime and improve the overall safety and reliability of industrial power distribution systems.
Its K tripping characteristic makes it particularly suitable for circuits with higher starting currents, including motors, transformers and inductive loads commonly found in industrial automation and manufacturing facilities.
| Current | 4 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | S300P |
| Model | S303P-K4 |
| Product ID | 2CDS383001R0337 |
| Product type | Miniature circuit breaker (MCB) |
| Current rating | 4 A |
| Number of poles | 3 |
| Tripping characteristic | K |
| Rated voltage | 415 V AC |
| Ultimate short-circuit breaking capacity (Icu) | 100 kA at 400 to 440 V AC |
| Rated breaking capacity | 25 kA |
| Frequency | 50 / 60 Hz |
| Protection rating | IP20 |
| Mounting type | DIN rail |
| Dimensions (H × W × D) | approx. 88 × 52.5 × 69 mm |
| Weight | approx. 0.37 kg |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
The S303P-K4 protects industrial electrical circuits against overloads and short circuits while providing reliable circuit isolation.
This miniature circuit breaker has a 4 A rated current.
The K curve is designed for circuits with higher inrush currents, making it suitable for motors, transformers and inductive industrial loads.
The ABB S303P-K4 is designed for quick installation onto a standard DIN rail.
It is commonly installed in industrial switchboards, machinery control panels and electrical distribution systems requiring high breaking capacity.
ABB S300P miniature circuit breakers are trusted by panel builders, OEM manufacturers and industrial engineers for delivering reliable protection, outstanding electrical performance and long service life in demanding applications.
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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...