ABB S303P-B50 three-pole miniature circuit breaker with a 50 A rated current, Type B tripping characteristic and 25 kA breaking capacity for industrial circuit protection.
£159.72
The ABB S303P-B50 (2CDS383001R0505) is a premium three-pole miniature circuit breaker (MCB) engineered to provide dependable protection against overloads and short circuits in industrial and commercial electrical installations. As part of the trusted ABB S300P series, it combines robust construction, high breaking capacity and reliable switching performance for demanding applications.
Manufactured to recognised IEC and UL standards, the S303P-B50 features a compact DIN rail design with fail-safe screw terminals and flexible top or bottom supply connection, making installation straightforward in industrial control panels, switchgear assemblies and power distribution systems.
With a rated current of 50 A, a Type B tripping characteristic and a 25 kA rated short-circuit breaking capacity, the S303P-B50 is ideal for protecting resistive loads, lighting circuits and general-purpose distribution circuits where rapid fault protection is required.
The ABB S303P-B50 automatically disconnects electrical circuits during overload or short-circuit conditions, helping protect cables, switchgear and connected equipment while improving system reliability and reducing downtime.
Its Type B tripping characteristic provides rapid operation at relatively low overcurrents, making it particularly suitable for resistive loads, lighting circuits, office installations and other applications where high inrush currents are not expected.
| Current | 50 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | S300P |
| Model | S303P-B50 |
| Product ID | 2CDS383001R0505 |
| EAN | 4016779077675 |
| Product type | Miniature circuit breaker (MCB) |
| Rated current | 50 A |
| Number of poles | 3 |
| Number of protected poles | 3 |
| Tripping characteristic | Type B |
| Rated AC voltage | 415 V AC |
| Rated DC voltage | 125 V DC |
| Rated insulation voltage | 500 V |
| Rated impulse withstand voltage | 6 kV |
| Rated breaking capacity | 25 kA |
| Ultimate short-circuit breaking capacity | Up to 100 kA at 400–440 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 |
The S303P-B50 protects three-phase electrical circuits against overloads and short circuits in commercial and industrial power distribution systems.
The ABB S303P-B50 has a 50 A rated current.
Type B circuit breakers trip quickly at relatively low overcurrents, making them ideal for resistive loads, lighting circuits and general electrical distribution.
The circuit breaker provides a rated short-circuit breaking capacity of 25 kA.
The breaker mounts directly onto a standard DIN rail inside switchboards, industrial control panels and electrical distribution systems.
ABB S300P miniature circuit breakers are trusted by electrical engineers, OEM manufacturers and panel builders for dependable protection, high breaking performance and long-term reliability in demanding industrial environments.
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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...