ABB S303P-K8NA miniature circuit breaker with an 8 A current rating, Type K tripping characteristic, 3P+N configuration and 25 kA breaking capacity for industrial electrical protection.
£204.57
The ABB S303P-K8NA, product code 2CDS383103R0407, is a premium miniature circuit breaker (MCB) designed to provide dependable protection against overloads and short circuits in industrial electrical installations. As part of the trusted ABB System pro M compact S300P series, it combines exceptional breaking capacity, robust construction and reliable operation for demanding industrial applications.
Featuring a Type K tripping characteristic, the S303P-K8NA is specifically engineered for circuits with high inrush currents, making it ideal for protecting motors, transformers, solenoids and other inductive loads. Its combined thermal and magnetic trip mechanisms provide rapid fault clearance while helping minimise nuisance tripping during equipment start-up.
With a rated current of 8 A, a 3P+N configuration and a rated operational voltage of up to 415 V AC, the S303P-K8NA is well suited to industrial distribution boards, machine control panels and OEM equipment. Its DIN rail mounting design enables straightforward installation while maintaining full compatibility with ABB System pro M compact accessories.
Miniature circuit breakers automatically disconnect electrical circuits when overloads or short circuits occur. The ABB S303P-K8NA combines thermal overload protection with rapid magnetic fault interruption, helping protect motors, transformers, machinery, cables and connected electrical equipment from excessive current and fault conditions.
Its Type K tripping characteristic is optimised for industrial motor circuits and inductive loads that experience high starting currents. This provides dependable protection while reducing unnecessary tripping, making the breaker ideal for machine builders and industrial automation applications.
| Current | 8 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | System pro M compact S300P |
| Model | S303P-K8NA |
| Product ID | 2CDS383103R0407 |
| Product type | Miniature circuit breaker |
| Rated current | 8 A |
| Tripping characteristic | Type K |
| Pole configuration | 3P+N |
| Total poles | 4 |
| Protected poles | 3 |
| Rated operational voltage | 415 V AC |
| Maximum AC voltage | 480Y/277 V AC |
| Maximum DC voltage | 125 V DC |
| 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 operating cycles |
| Dimensions (H × W × D) | approx. 88 × 70 × 69 mm |
| Weight | approx. 0.496 kg |
| EAN | 4016779076982 |
| Country of origin | Germany |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
The ABB S303P-K8NA protects industrial three-phase electrical circuits against overloads and short circuits, particularly those supplying motors and inductive loads.
The S303P-K8NA has a rated current of 8 A.
Type K circuit breakers are designed for applications with higher inrush currents, making them ideal for motors, transformers and other inductive electrical equipment.
The breaker provides a rated short-circuit breaking capacity of 25 kA.
The breaker is designed for installation on a standard DIN rail inside industrial control panels, electrical distribution boards 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-term reliability.
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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...