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.
