ABB S303P-B8 MCB – 3P – B Curve – 8A – 25kA

Why Choose the ABB S303P-B8 Miniature Circuit Breaker?

The ABB S303P-B8 is a high-performance miniature circuit breaker (MCB) designed to provide reliable overload and short-circuit protection for demanding electrical installations. As part of the ABB System pro M compact S300P series, it combines a high 25 kA breaking capacity with a compact modular design for industrial, commercial and infrastructure applications.

This three-pole circuit breaker uses a B tripping characteristic and a rated current of 8 A, making it suitable for protecting circuits where relatively low overcurrent thresholds are required. The S300P series provides dependable protection against overloads and short circuits while supporting straightforward integration into modern electrical distribution systems.

With an AC supply, an 8 A rated current and a 25 kA rated breaking capacity, the S303P-B8 provides robust circuit protection in distribution boards and control panels. Its 3P configuration without a neutral pole provides simultaneous protection and switching of three phases, while DIN-rail mounting enables straightforward installation.

Key Advantages

• High-performance miniature circuit breaker designed for demanding electrical installations.
• 8 A rated current suitable for a range of industrial and commercial circuits.
• B tripping characteristic for sensitive overcurrent protection.
• 3P configuration without a neutral pole for three-phase circuit protection.
• 25 kA rated breaking capacity for robust fault protection.
• Convenient DIN-rail mounting for distribution boards and control panels.

Key Features

• ABB System pro M compact S300P series.
• 8 A rated current.
• B tripping characteristic.
• 3-pole configuration without neutral.
• 25 kA rated breaking capacity.
• AC supply operation.
• Thermal overload and electromechanical short-circuit protection.
• DIN-rail mounting for compact electrical distribution systems.
• Trip position indication for improved identification of tripped devices.
• Compatible with System pro M compact accessories.

Reliable Circuit Protection for Demanding Applications

Miniature circuit breakers such as the ABB S303P-B8 protect electrical circuits against excessive current caused by overloads and short circuits. The breaker combines thermal protection for overload conditions with electromechanical protection for short-circuit conditions, helping safeguard electrical wiring and connected equipment.

The S300P series is designed for demanding industrial and commercial electrical installations, offering high fault protection performance and compatibility with System pro M compact accessories. The S303P-B8's B characteristic provides relatively sensitive overcurrent protection, while its three-pole configuration provides protection across three-phase circuits.

Typical Applications

• Industrial electrical distribution boards.
• Three-phase control panels and switchboards.
• Commercial electrical installations.
• Control circuits and low-current electrical loads.
• Industrial machinery and automation equipment.
• Building-services distribution equipment.