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2CDS383001R0201 ABB S303P-D20 Miniature Circuit Breaker – 3P – D – 20 A
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.
£88.58
Why Choose the ABB S303P-D20 Miniature Circuit Breaker?
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.
Key Advantages
- High-performance three-pole miniature circuit breaker for industrial installations.
- 20 A rated current for three-phase electrical circuits.
- D curve tripping characteristic accommodates high inrush currents.
- 25 kA breaking capacity for demanding fault conditions.
- Manufactured in accordance with international IEC and UL standards.
- Compact DIN rail format simplifies panel installation and maintenance.
Key Features
- ABB System pro M compact S300P series.
- 20 A rated current.
- Three protected poles.
- D curve tripping characteristic.
- 415 V AC rated operational voltage.
- 25 kA short-circuit breaking capacity.
- IP20 protection rating.
- Standard 35 mm DIN rail mounting.
Reliable Protection for High-Inrush Electrical 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.
Typical Applications
- Industrial motors and machinery.
- Transformers and power supplies.
- Welding equipment.
- Compressors and pumping systems.
- Industrial control panels and switchboards.
- Circuits with high starting or magnetising currents.
Technical Specifications
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| Current | 20 A | |
|---|---|---|
| Phase | Three Phase | |
| Poles | 3-pole | |
| Device Type | MCB | |
| Trip Curve | D curve | |
| Breaking Capacity | 25 kA | |
| 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 |
Frequently Asked Questions
What is the ABB S303P-D20 used for?
It protects three-phase industrial electrical circuits against overloads and short circuits, particularly where equipment produces high starting or inrush currents.
What is the rated current of this circuit breaker?
The ABB S303P-D20 has a rated current of 20 A.
What does the D curve tripping characteristic mean?
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.
What is the breaking capacity of the S303P-D20?
The circuit breaker provides a 25 kA short-circuit breaking capacity for dependable protection in demanding industrial installations.
How is the ABB S303P-D20 installed?
The breaker is designed for mounting on a standard 35 mm DIN rail inside electrical distribution boards, switchboards and industrial control panels.
Trusted by Electrical Professionals Worldwide
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.
