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2CDS383001R0577 ABB S303P-K50 Miniature Circuit Breaker – 3P – K – 50 A
ABB S303P-K50 three-pole miniature circuit breaker with a 50 A rated current, Type K tripping characteristic and 25 kA breaking capacity for industrial motor and circuit protection.
£120.15
Why Choose the ABB S303P-K50 Miniature Circuit Breaker?
The ABB S303P-K50 (2CDS383001R0577) is a premium three-pole 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 series, it delivers high fault-breaking performance, robust construction and reliable operation for industrial power distribution and motor protection.
Manufactured in accordance with IEC/EN 60947-2, UL 1077 and CSA standards, the S303P-K50 is designed for industrial control panels, switchgear assemblies and OEM equipment. Its compact DIN rail design, fail-safe screw terminals and flexible top or bottom supply connection enable fast installation and long-term reliability.
With a rated current of 50 A, a Type K tripping characteristic and a rated ultimate short-circuit breaking capacity of 25 kA at 415 V AC, the S303P-K50 is ideally suited to protecting motors, transformers, compressors and other inductive loads with high inrush currents.
Key Advantages
- Industrial-grade three-pole miniature circuit breaker.
- 50 A rated current for demanding industrial applications.
- Type K tripping characteristic ideal for motors and inductive loads.
- 25 kA breaking capacity for excellent fault protection.
- Fail-safe terminals provide secure conductor installation.
- Compact DIN rail mounting for quick panel installation.
Key Features
- ABB S300P series.
- Three-pole configuration.
- 50 A rated current.
- Type K tripping characteristic.
- Rated operating voltage up to 415 V AC.
- Rated operating voltage up to 125 V DC.
- 25 kA rated ultimate short-circuit breaking capacity.
- Fail-safe screw terminals.
- Top or bottom supply connection.
- Compatible with ABB System pro M Compact accessories.
Reliable Protection for Industrial Motors and Equipment
The ABB S303P-K50 automatically disconnects electrical circuits during overload or short-circuit conditions, protecting motors, transformers, cables and connected equipment from electrical damage while helping reduce downtime and maintenance costs.
Its Type K tripping characteristic is specifically designed for circuits with elevated starting currents, making it an excellent choice for motor control centres, industrial machinery and OEM equipment requiring dependable protection without nuisance tripping.
Typical Applications
- Three-phase motor protection.
- Industrial control panels.
- Machine building and OEM equipment.
- Transformers and inductive loads.
- Industrial power distribution.
- Manufacturing and automation systems.
Technical Specifications
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| Certification | UL 1077 | |
|---|---|---|
| Current | 50 A | |
| Phase | Three Phase | |
| Poles | 3-pole | |
| Device Type | MCB | |
| Trip Curve | K curve | |
| Breaking Capacity | 25 kA | |
| Manufacturer | ABB | |
| Series | S300P | |
| Model | S303P-K50 | |
| Product ID | 2CDS383001R0577 | |
| EAN | 4016779077606 | |
| Product type | Miniature circuit breaker (MCB) | |
| Rated current | 50 A | |
| Number of poles | 3 | |
| Number of protected poles | 3 | |
| Tripping characteristic | Type K | |
| Rated AC voltage | 415 V AC | |
| Rated DC voltage | 125 V DC | |
| Rated insulation voltage | 500 V | |
| Rated impulse withstand voltage | 6 kV | |
| Rated ultimate short-circuit breaking capacity | 25 kA | |
| Rated service breaking capacity | 15 kA at 400 V AC | |
| Frequency | 50 / 60 Hz | |
| Protection rating | IP20 | |
| Mounting type | DIN rail | |
| Dimensions (H × W × D) | 88 × 52.5 × 69 mm | |
| Weight | Approx. 0.372 kg | |
| HS Code | 85362010 | |
| Country of Manufacture | Germany |
Frequently Asked Questions
What is the ABB S303P-K50 used for?
The S303P-K50 protects industrial three-phase circuits against overloads and short circuits, particularly circuits supplying motors, transformers and other inductive equipment.
What is the rated current of this circuit breaker?
The ABB S303P-K50 has a rated current of 50 A.
What does the Type K tripping characteristic provide?
Type K circuit breakers are designed for motors and inductive loads with high inrush currents, helping prevent nuisance tripping while maintaining reliable protection.
What is the breaking capacity of the S303P-K50?
The breaker provides a rated ultimate short-circuit breaking capacity of 25 kA at 415 V AC.
How is the ABB S303P-K50 installed?
The breaker mounts directly onto a standard DIN rail inside industrial control panels, switchboards and electrical distribution systems.
Trusted by Industrial Professionals Worldwide
ABB S300P miniature circuit breakers are trusted by electrical engineers, panel builders and OEM manufacturers for dependable protection, high breaking performance and reliable operation in demanding industrial environments.
