ABB S304P-D40 MCB – 4P – D Curve – 40A – 25kA

Why Choose the ABB S304P-D40 Miniature Circuit Breaker?

The ABB S304P-D40 is a compact and high-performance miniature circuit breaker (MCB) designed to provide reliable protection against overloads and short circuits in industrial and electrical distribution systems. As part of the ABB System pro M compact S300P series, it combines high breaking capacity with practical DIN-rail installation for professional low-voltage applications.

This circuit breaker features a D tripping characteristic, providing protection for circuits with high inrush currents such as motors, transformers and industrial equipment. The 4-pole configuration provides four protected poles without a neutral pole, making the device suitable for multi-pole AC circuit protection where a switched neutral is not required.

With a rated current of 40 A, a 25 kA rated breaking capacity and an AC supply, the S304P-D40 is suited to industrial machinery, automation systems and electrical distribution applications where dependable circuit protection and compact panel integration are required.

Key Advantages

• Compact miniature circuit breaker designed for industrial and electrical distribution applications.
• 40 A rated current for reliable circuit protection.
• D tripping characteristic for circuits with high starting and inrush currents.
• 25 kA rated breaking capacity for high-level short-circuit protection.
• 4P configuration without neutral for multi-pole AC circuit protection.
• DIN-rail mounting for straightforward installation in distribution boards and control panels.
• Part of the ABB System pro M compact S300P range for professional circuit protection.

Key Features

• ABB System pro M compact S300P series.
• 40 A rated current.
• D tripping characteristic.
• 4-pole configuration.
• No neutral pole.
• 25 kA rated breaking capacity.
• AC supply.
• DIN-rail mounting for efficient panel installation.
• Compact modular design for electrical distribution equipment.
• Reliable overload and short-circuit protection.

Reliable Circuit Protection for Industrial Installations

Miniature circuit breakers such as the ABB S304P-D40 protect electrical circuits by automatically disconnecting the supply when an overload or short circuit reaches a level that could otherwise damage conductors and connected equipment. The D tripping characteristic is designed for applications where electrical loads produce significant starting currents.

The S300P series is designed for demanding industrial and electrical installations, combining high breaking performance with a compact modular format. The S304P-D40's four-pole arrangement provides flexible multi-pole circuit protection where a neutral switching pole is not required.

Typical Applications

• Industrial electrical distribution systems.
• Motor and transformer protection circuits.
• Automation and control panels.
• Industrial machinery and production equipment.
• Electrical switchboards and distribution boards.
• Commercial and industrial building installations.
• Low-voltage AC circuit protection applications.