Why Choose the ABB S303P-K8NA Miniature Circuit Breaker?
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.
Key Advantages
- Reliable overload and short-circuit protection.
- 8 A rated current for industrial motor and control circuits.
- Type K tripping characteristic for inductive loads with high inrush currents.
- 3P+N configuration with switched neutral.
- 25 kA breaking capacity for demanding industrial installations.
- Compatible with ABB System pro M compact accessories.
Key Features
- ABB System pro M compact S300P series.
- 8 A nominal current rating.
- Type K tripping characteristic.
- Three protected poles plus switched neutral.
- Rated operational voltage up to 415 V AC.
- 25 kA short-circuit breaking capacity.
- Integrated trip indicator for quick fault identification.
- Dual DIN rail release for fast installation and removal.
Reliable Protection for Industrial Motor Circuits
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.
Typical Applications
- Motor starter circuits.
- Industrial machinery and manufacturing equipment.
- Automation and control panels.
- Transformer and inductive load protection.
- Three-phase industrial distribution systems.
- OEM machine building applications.
