ABB S303P-D25 MCB – 3P – D Curve – 25A – 25kA

Why Choose the ABB S303P-D25 Miniature Circuit Breaker?

The ABB S303P-D25 is a robust and high-performance miniature circuit breaker (MCB) designed to protect electrical installations against overloads and short circuits. As part of the ABB System pro M compact S300P series, it is developed for demanding industrial installations where dependable circuit protection and high short-circuit performance are required.

This three-pole circuit breaker provides D-type tripping characteristics, making it suitable for circuits where higher inrush currents can occur. Its three protected poles switch without a neutral pole, while the compact modular construction allows straightforward installation within electrical distribution and control systems.

With a rated current of 25 A and a rated breaking capacity of 25 kA, the S303P-D25 provides high-level protection for industrial AC electrical circuits. Its DIN-rail mounting and compact modular construction make it suitable for installation in distribution boards, control panels and industrial switchgear assemblies.

Key Advantages

• Compact three-pole miniature circuit breaker for industrial applications.
• 25 A rated current for reliable circuit protection.
• D tripping characteristic suitable for circuits with higher starting or inrush currents.
• 25 kA rated breaking capacity for high short-circuit protection performance.
• Three protected poles with no switched neutral.
• DIN-rail mounting for straightforward installation in electrical distribution equipment.

Key Features

• ABB System pro M compact S300P series.
• S303P-D25 type designation.
• 25 A rated current.
• D tripping characteristic.
• 3-pole configuration with no neutral pole.
• 25 kA rated breaking capacity.
• Designed for AC electrical systems.
• DIN-rail mounting for modular electrical installations.

Reliable Circuit Protection for Industrial Electrical Systems

Miniature circuit breakers such as the ABB S303P-D25 protect electrical circuits by automatically interrupting the supply when an overload or short circuit occurs. The D-type characteristic is particularly suited to applications where equipment can produce comparatively high transient or starting currents.

The S300P series is designed for industrial installations and combines compact modular construction with high short-circuit interruption capability. Its three-pole configuration provides simultaneous protection and switching of three AC circuit conductors without a switched neutral pole.

Typical Applications

• Industrial distribution boards and switchboards.
• Electrical control panels and automation systems.
• Machinery and industrial equipment circuits.
• Motor and transformer circuits with higher inrush currents.
• Commercial and industrial electrical installations.
• General AC circuit protection requiring a D-type characteristic.