ABB S303P-D20 three-pole miniature circuit breaker with a 20 A rated current, D curve tripping characteristic and 25 kA breaking capacity for high-inrush industrial electrical loads.
£161.05
The ABB S303P-D20 is a high-performance three-pole miniature circuit breaker (MCB) designed to protect industrial electrical installations against overloads and short circuits. As part of the established ABB System pro M compact S300P series, it combines dependable circuit protection with a high breaking capacity for demanding low-voltage distribution applications.
Manufactured in accordance with international IEC and UL product standards, the S303P-D20 features a compact modular design for straightforward installation within switchboards, distribution boards and industrial control panels. Its robust operating mechanism and secure terminal arrangement support reliable switching, safe conductor connection and long-term performance.
With a 20 A rated current, a D curve tripping characteristic and a 25 kA breaking capacity, this miniature circuit breaker is particularly suitable for circuits supplying equipment with high starting currents, including motors, transformers, welding equipment and other inductive loads.
The ABB S303P-D20 automatically disconnects the electrical supply when an overload or short circuit occurs, helping protect cables, machinery and connected equipment from damage. Its D curve characteristic permits higher momentary starting currents than B or C curve breakers, reducing unwanted tripping when inductive equipment is energised.
The S300P range is designed for industrial installations requiring strong short-circuit performance and dependable operation. Its modular construction enables efficient integration with ABB protection devices and accessories in modern electrical distribution and automation systems.
| Current | 20 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | System pro M compact S300P |
| Model | S303P-D20 |
| SKU | 2CDS383001R0201 |
| EAN | 4016779078023 |
| Product type | Miniature circuit breaker (MCB) |
| Rated current | 20 A |
| Tripping characteristic | D Curve |
| Number of poles | 3 |
| Rated operational voltage | 415 V AC |
| DC operating voltage | up to 125 V DC |
| Frequency | 50 / 60 Hz |
| Breaking capacity | 25 kA |
| Rated insulation voltage | 500 V AC |
| Overvoltage category | IV |
| Pollution degree | 3 |
| Protection rating | IP20 |
| Mounting type | 35 mm DIN rail |
| Dimensions (H × W × D) | approx. 88 × 52.5 × 69 mm |
| Weight | approx. 0.37 kg |
It protects three-phase industrial electrical circuits against overloads and short circuits, particularly where equipment produces high starting or inrush currents.
The ABB S303P-D20 has a rated current of 20 A.
A D curve circuit breaker accommodates high momentary inrush currents before magnetic tripping, making it suitable for motors, transformers, welding equipment and other inductive loads.
The circuit breaker provides a 25 kA short-circuit breaking capacity for dependable protection in demanding industrial installations.
The breaker is designed for mounting on a standard 35 mm DIN rail inside electrical distribution boards, switchboards and industrial control panels.
ABB System pro M compact miniature circuit breakers are trusted by electrical engineers, panel builders and machine manufacturers for dependable circuit protection, high breaking performance and reliable operation in industrial 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...