ABB S303P-K50NA 50A Type K miniature circuit breaker with 3P+N configuration and 25 kA breaking capacity for industrial electrical protection.
£266.82
The ABB 2CDS383103R0577, also identified as the S303P-K50NA, is a high-performance miniature circuit breaker (MCB) designed to provide reliable protection against overloads and short circuits in industrial electrical installations. As part of the proven ABB System pro M compact S300P series, it offers exceptional reliability, a high breaking capacity and compliance with international standards for demanding industrial applications.
Featuring a Type K tripping characteristic, this circuit breaker is ideally suited to motors, transformers, compressors and other inductive loads that generate high inrush currents during start-up. Its combined thermal and magnetic trip mechanism ensures dependable overload protection while rapidly disconnecting short-circuit faults to safeguard equipment and minimise downtime.
With a rated current of 50 A, a 3P+N configuration and a rated operational voltage of up to 415 V AC, the S303P-K50NA is ideal for industrial control panels, switchboards and machine building applications. Its 25 kA breaking capacity, DIN rail mounting and compact design simplify installation while delivering dependable long-term protection.
The ABB S303P-K50NA automatically disconnects electrical circuits whenever overload or short-circuit conditions occur, helping protect electrical infrastructure, industrial machinery and connected equipment. Its robust design delivers reliable long-term performance in demanding industrial environments.
Its Type K tripping characteristic is specifically intended for motors and other inductive loads with high inrush currents. This enables reliable equipment start-up while maintaining rapid protection during genuine fault conditions.
| Current | 50 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | System pro M compact S300P |
| Model | S303P-K50NA |
| Product ID | 2CDS383103R0577 |
| EAN | 4016779135597 |
| Product type | Miniature circuit breaker |
| Rated current | 50 A |
| Number of poles | 3P+N |
| Protected poles | 3 |
| Neutral pole | Switched |
| Tripping characteristic | Type K |
| Rated operational voltage | 415 V AC |
| Voltage type | AC/DC |
| Rated frequency | 50 / 60 Hz |
| Rated insulation voltage | 500 V |
| Impulse withstand voltage | 6 kV |
| Ultimate short-circuit breaking capacity | 25 kA |
| Breaking capacity (IEC 60898-1) | 15 kA at 400 V AC |
| Protection rating | IP20 (IP40 when installed in a suitable enclosure) |
| Mounting type | 35 mm DIN rail |
| Terminal capacity | 0.75 to 35 mm² solid, 0.75 to 25 mm² flexible |
| Operating temperature | -40 to +70 °C |
| Approximate dimensions (H × W × D) | 88 × 70 × 69 mm |
| Approximate weight | 0.496 kg |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
It protects industrial three-phase electrical circuits against overloads and short circuits, particularly those supplying motors, transformers and other inductive equipment.
The ABB S303P-K50NA has a rated current of 50 A.
Type K breakers are designed for circuits with high inrush currents, making them ideal for motors, transformers and other inductive loads while reducing nuisance tripping.
The breaker provides a rated ultimate short-circuit breaking capacity of 25 kA under IEC 60947-2.
The breaker mounts directly onto a standard 35 mm DIN rail inside industrial control panels and electrical distribution boards.
ABB System pro M compact S300P miniature circuit breakers are trusted worldwide for delivering dependable overload and short-circuit protection in industrial automation, machine building and electrical distribution systems.
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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...