ABB S303P-K2NA miniature circuit breaker with a 2 A rating, Type K tripping characteristic, 3P+N configuration and 25 kA breaking capacity for industrial electrical protection.
£249.05
The ABB 2CDS383103R0277, also known as the S303P-K2NA, is a premium 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 System pro M compact range, it combines exceptional fault-clearing performance, compact dimensions and long-term reliability for industrial power distribution systems.
Featuring a 3P+N configuration, the S303P-K2NA protects all three phase conductors while incorporating a switched neutral pole. Its Type K tripping characteristic is specifically designed for circuits with high inrush currents, making it ideal for motors, transformers, contactors, solenoids and other inductive industrial loads where nuisance tripping must be minimised.
With a rated current of 2 A, a rated operating voltage of 415 V AC, a 25 kA rated short-circuit breaking capacity (Icn) and a 100 kA ultimate breaking capacity (Icu), the ABB S303P-K2NA delivers dependable protection for industrial control panels, OEM machinery, automation systems and electrical distribution boards.
The ABB S303P-K2NA combines thermal overload protection with instantaneous magnetic short-circuit protection to safeguard industrial machinery, cabling and electrical distribution systems. This dual protection improves operational safety while helping minimise costly downtime and equipment damage.
Its Type K characteristic is specifically intended for applications where motors, transformers and magnetic devices produce high transient starting currents, allowing normal equipment start-up while still delivering rapid fault disconnection during genuine short-circuit conditions.
| Current | 2 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | S300P System pro M compact |
| Model | S303P-K2NA |
| Manufacturer Part Number | 2CDS383103R0277 |
| Product Type | Miniature Circuit Breaker (MCB) |
| Rated Current | 2 A |
| Tripping Characteristic | Type K |
| Pole Configuration | 3P+N |
| Protected Poles | 3 |
| Rated Voltage | Up to 415 V AC |
| Maximum Operating Voltage | 480Y/277 V AC, 125 V DC |
| Voltage Type | AC/DC |
| Frequency | 50 / 60 Hz |
| Rated Short-Circuit Breaking Capacity (Icn) | 25 kA |
| Ultimate Breaking Capacity (Icu) | 100 kA |
| Rated Insulation Voltage (Ui) | 500 V |
| Impulse Withstand Voltage (Uimp) | 6 kV |
| Protection Rating | IP20 |
| Terminal Capacity | 0.75–35 mm² rigid, 0.75–25 mm² flexible |
| Mounting | DIN Rail |
| Operating Temperature | -40°C to +70°C |
| Electrical Endurance | 20,000 operating cycles |
| Dimensions (H × W × D) | Approx. 88 × 70 × 69 mm |
| Weight | Approx. 0.496 kg |
| EAN | 4016779077125 |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
It protects three-phase industrial electrical circuits against overloads and short circuits, particularly those supplying motors, transformers and other inductive equipment.
The ABB S303P-K2NA has a rated operational current of 2 A.
Type K circuit breakers tolerate higher inrush currents than conventional breakers while still providing rapid protection during genuine fault conditions.
The breaker provides a rated short-circuit breaking capacity of 25 kA and an ultimate breaking capacity of 100 kA.
It is designed for installation on a standard DIN rail inside industrial control panels, switchboards and electrical distribution boards.
ABB S300P miniature circuit breakers are trusted by industrial engineers, panel builders and OEM manufacturers worldwide for delivering dependable overload and short-circuit protection in demanding electrical installations.
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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...