Hager CFA440J Residual Current Circuit Breaker 4P 40A 300mA Type A

The Hager CFA440J is a professional-grade 4-pole residual current circuit breaker (RCCB) engineered to provide robust electrical protection in modern installations. This device is specifically designed to monitor electrical circuits for earth leakage faults, automatically disconnecting the power supply when a residual current is detected. By incorporating advanced Type A technology, it ensures reliable detection of both alternating sinusoidal residual currents and pulsating direct residual currents, making it a versatile solution for diverse electrical environments.

Advantages

The primary benefit of the Hager CFA440J lies in its high level of operational reliability and safety. As a Type A device, it offers broader protection than standard AC-type breakers, covering a wider range of potential fault currents often found in modern electronic equipment. Its 4-pole configuration allows for seamless integration into three-phase electrical systems, providing comprehensive coverage for all phases and the neutral conductor. The robust construction ensures long-term durability and consistent performance under standard operating conditions, contributing to the overall safety of residential and commercial electrical infrastructures.

Suitable for

• Residential electrical distribution boards
• Commercial building power systems
• Protection of circuits with electronic components
• Three-phase electrical installations

This device is not intended for use in circuits where the residual current is purely direct current, as it is specifically calibrated for AC and pulsating DC signals. It should not be used as a substitute for a miniature circuit breaker (MCB) as it does not provide protection against overloads or short circuits.

Key specifications

• Number of poles: 4
• Rated current: 40A
• Residual current sensitivity: 300mA
• Type: A

Installation of the Hager CFA440J must be performed by a qualified electrician in accordance with local electrical regulations. The device is typically mounted on a standard DIN rail within a distribution board. Ensure that all connections are tightened to the specified torque to prevent overheating and ensure proper electrical contact. Regular testing using the integrated test button is recommended to verify the mechanical functionality of the tripping mechanism.

What to consider before purchase

• Verify that the 40A rated current matches your circuit requirements
• Ensure the 300mA sensitivity is appropriate for your specific safety application
• Check that your installation requires a 4-pole device
• Confirm compatibility with your existing distribution board layout

For optimal safety, perform a manual test of the residual current circuit breaker at least every six months by pressing the test button to ensure the device trips correctly.