ABB S303P-B20 three-pole miniature circuit breaker with a 20 A rated current, B curve tripping characteristic and 25 kA breaking capacity for industrial and commercial electrical protection.
£122.45
The ABB S303P-B20 is a premium three-pole miniature circuit breaker (MCB) designed to provide dependable protection against overloads and short circuits in industrial, commercial and OEM electrical installations. As part of the trusted ABB System pro M compact S300P series, it delivers exceptional breaking capacity, reliable operation and compliance with international IEC and UL standards.
Built for demanding low voltage applications, the S303P-B20 combines robust construction with a compact DIN rail mounted design, allowing quick installation inside distribution boards, switchboards and industrial control panels. Its integrated trip indication, fail-safe terminals and compatibility with ABB System pro M accessories simplify maintenance while ensuring long-term reliability.
Featuring a 20 A rated current, a B curve tripping characteristic and a 25 kA breaking capacity, this miniature circuit breaker is ideally suited for protecting lighting circuits, resistive loads and general electrical distribution where rapid fault protection is required.
The ABB S303P-B20 automatically disconnects electrical circuits whenever overload or short-circuit conditions occur, protecting wiring, switchgear and connected equipment from electrical damage. Its B curve characteristic provides fast tripping at relatively low overcurrent levels, making it particularly suitable for lighting circuits and resistive electrical loads.
The ABB S300P range is trusted worldwide by electrical contractors, OEM machine builders and panel manufacturers for delivering dependable protection, straightforward installation and excellent long-term reliability in industrial and commercial environments.
| Current | 20 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | System pro M compact S300P |
| Model | S303P-B20 |
| SKU | 2CDS383001R0205 |
| EAN | 4016779078009 |
| Product type | Miniature circuit breaker (MCB) |
| Rated current | 20 A |
| Tripping characteristic | B Curve |
| Number of poles | 3 |
| Rated operational voltage | 415 V AC |
| Maximum operating voltage | 480Y/277 V AC, 125 V DC |
| Frequency | 50 / 60 Hz |
| Breaking capacity | 25 kA |
| Rated insulation voltage | 500 V |
| Protection rating | IP20 |
| Mounting type | 35 mm DIN rail |
| Dimensions (H × W × D) | approx. 88 × 52.5 × 69 mm |
| Weight | approx. 0.372 kg |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
It provides overload and short-circuit protection for three-phase electrical circuits in industrial, commercial and OEM applications.
The ABB S303P-B20 has a 20 A rated current.
A B curve breaker trips quickly at relatively low overcurrent levels, making it ideal for lighting circuits and resistive electrical loads.
The S303P-B20 provides a 25 kA short-circuit breaking capacity for demanding industrial and commercial installations.
The miniature circuit breaker is designed for installation on a standard 35 mm DIN rail inside switchboards, distribution boards and industrial control panels.
ABB System pro M compact miniature circuit breakers are trusted by electricians, panel builders and industrial engineers for delivering dependable circuit protection, excellent electrical performance and long service life.
● Service Agreements
Credit Accounts
Our service agreements are built to support long term procurement relationships. By working closely with engineering teams and procurement departments, we help streamline purchasing processes while ensuring consistent access to critical components and sourcing support when it matters most.
● frequently asked questions
At Led Controls Ltd we help engineers source the right automation and control gear with confidence. below are quick answers to what we are asked most often.
We supply all leading manfacturers in our industry. we offer next day delivery on most poplour products.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
● latest blog
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...