ABB S303P-K4NA miniature circuit breaker with a 4 A current rating, Type K tripping characteristic, 3P+N configuration and 25 kA breaking capacity for industrial circuit protection.
£231.23
The ABB S303P-K4NA, product code 2CDS383103R0337, is a premium miniature circuit breaker (MCB) designed to provide dependable protection against overloads and short circuits in demanding industrial electrical installations. As part of the proven ABB System pro M compact S300P series, it delivers exceptional breaking capacity, robust construction and reliable performance for industrial distribution and machine protection applications.
Featuring a Type K tripping characteristic, the S303P-K4NA is specifically engineered for circuits with higher inrush currents, making it ideal for protecting motors, transformers, solenoids and inductive loads. Its combined thermal and magnetic tripping mechanisms ensure rapid fault clearance while maintaining excellent operational reliability.
With a rated current of 4 A, a 3P+N configuration and a rated operational voltage of up to 415 V AC, this miniature circuit breaker is suitable for three-phase industrial systems requiring simultaneous neutral switching. Its compact DIN rail design enables straightforward installation in electrical distribution boards and control panels.
Miniature circuit breakers automatically disconnect electrical circuits when overloads or short circuits occur. The ABB S303P-K4NA combines thermal overload protection with rapid magnetic fault interruption to help protect electrical equipment, wiring and personnel from potentially damaging fault conditions.
Its Type K tripping characteristic is optimised for circuits supplying motors and inductive equipment where higher inrush currents occur during start-up. This provides dependable protection while reducing unnecessary nuisance tripping in industrial applications.
| Current | 4 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | System pro M compact S300P |
| Model | S303P-K4NA |
| Product ID | 2CDS383103R0337 |
| Product type | Miniature circuit breaker |
| Rated current | 4 A |
| Tripping characteristic | Type K |
| Pole configuration | 3P+N |
| Total poles | 4 |
| Protected poles | 3 |
| Rated operational voltage | 415 V AC |
| Frequency | 50 / 60 Hz |
| Breaking capacity | 25 kA |
| Protection rating | IP20 (IP40 when installed in a suitable enclosure) |
| Mounting type | DIN rail mounting |
| Terminal capacity | 0.75 to 35 mm² |
| Mechanical endurance | 20,000 operating cycles |
| Electrical endurance | 20,000 AC operating cycles |
| Dimensions (H × W × D) | approx. 88 × 70 × 69 mm |
| Weight | approx. 0.37 kg |
| EAN | 4016779077057 |
| Country of origin | Germany |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
The ABB S303P-K4NA protects industrial three-phase electrical circuits against overloads and short circuits, particularly those supplying motors and inductive loads.
The S303P-K4NA has a rated current of 4 A.
Type K circuit breakers are designed for applications with higher inrush currents, making them ideal for motors, transformers and other inductive electrical loads.
The breaker provides a rated short-circuit breaking capacity of 25 kA for demanding industrial installations.
The breaker is designed for mounting on a standard DIN rail inside electrical distribution boards, industrial control panels and machinery enclosures.
ABB System pro M compact miniature circuit breakers are trusted worldwide by electrical engineers, panel builders and industrial automation professionals for dependable protection, high breaking capacity and long service life.
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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...