Why Choose the ABB S303P-D40 Miniature Circuit Breaker?
The ABB S303P-D40 is a robust three-pole miniature circuit breaker (MCB) designed to provide reliable protection against overloads and short circuits in industrial electrical installations. As part of the ABB System pro M compact S300P series, it combines a high 25 kA breaking capacity with a D tripping characteristic for demanding circuit protection applications.
The S303P-D40 provides thermal-magnetic overcurrent protection and is designed for use in electrical distribution and industrial control systems where dependable circuit protection is required. Its three-pole configuration protects three live conductors without a neutral pole, while the compact modular design supports straightforward installation within distribution boards and control panels.
With a 40 A rated current, D tripping characteristic and 25 kA rated ultimate short-circuit breaking capacity at 415 V AC, the S303P-D40 is suited to circuits where higher inrush currents can occur. Its DIN-rail mounting and screw terminal arrangement provide practical installation within professional electrical assemblies.
Key Advantages
- Three-pole miniature circuit breaker designed for industrial electrical protection.
- 40 A rated current for circuit protection applications.
- D tripping characteristic suitable for circuits with higher starting or inrush currents.
- 25 kA rated breaking capacity at 415 V AC.
- DIN-rail mounting for convenient installation in distribution and control equipment.
- Designed to protect electrical circuits against overloads and short circuits.
Key Features
- ABB System pro M compact S300P series.
- S303P-D40 three-pole configuration.
- 40 A rated current.
- D tripping characteristic.
- 25 kA rated ultimate short-circuit breaking capacity.
- Three poles with no neutral pole.
- Thermal-magnetic overcurrent protection.
- DIN-rail mounting design.
- Failsafe bi-directional cylinder-lift screw terminals.
- 50 / 60 Hz rated frequency.
- Integrated trip indication for clear identification of the tripped position.
Reliable Overcurrent Protection for Industrial Circuits
The ABB S303P-D40 combines thermal and magnetic protection to disconnect a circuit when excessive current conditions occur. The thermal mechanism responds to sustained overload conditions, while the magnetic protection provides rapid interruption during short-circuit events.
The D characteristic is intended for applications where circuits can experience comparatively high transient or starting currents. This makes the S300P D-characteristic range suitable for selected industrial loads and equipment where higher inrush currents need to be accommodated while maintaining dependable circuit protection.
Typical Applications
- Industrial electrical distribution systems.
- Motor and machinery circuits requiring D-characteristic protection.
- Control panels and switchboards.
- Industrial automation installations.
- Manufacturing and production equipment.
- Electrical circuits with higher inrush currents.
- OEM machinery and professional electrical installations.
