Hager CDF640D Residual Current Circuit Breaker 4P 40A 30mA 10kA Type F

The Hager CDF640D is a high-performance 4-pole residual current circuit breaker (RCCB) engineered to provide reliable electrical protection in modern residential and commercial environments. With a rated current of 40A and a sensitivity of 30mA, this device is designed to detect leakage currents and disconnect the circuit instantly, preventing potential hazards. As a Type F device, it offers advanced protection by identifying both AC and pulsating DC residual currents, which are common in modern electronic equipment.

Advantages

The primary advantage of the Hager CDF640D is its specialized Type F technology, which ensures stability and safety in circuits containing frequency converters, single-phase inverters, and other power electronics. Unlike standard Type AC or A breakers, this unit is resistant to nuisance tripping caused by high-frequency interference, ensuring continuous operation of sensitive equipment. Its robust construction and 10kA short-circuit capacity provide long-term durability and high safety standards for complex electrical installations.

Suitable for

• Circuits powering frequency converters and variable speed drives
• Single-phase inverters in solar power systems
• Heat pump installations and modern HVAC systems
• Residential and commercial electrical distribution boards

When it may not be suitable

This device is not intended for use in circuits where only simple resistive loads are present, as a standard Type AC or Type A RCCB may be sufficient and more cost-effective. It is also not designed for high-voltage industrial applications exceeding its rated current and short-circuit capacity specifications.

Key specifications

• Number of poles: 4
• Rated current: 40A
• Sensitivity: 30mA
• Short-circuit capacity: 10kA
• Type: F

How to use

The Hager CDF640D must be installed by a qualified electrician in accordance with local electrical regulations. It is typically mounted on a standard DIN rail within a distribution board. Ensure that the supply cables are correctly connected to the input terminals and the load circuits to the output terminals, observing the correct polarity and torque settings as specified in the installation manual. After installation, the device should be tested using the integrated test button to verify its mechanical operation.

What to consider before purchase

• Verify that the 40A rated current matches your circuit requirements
• Ensure the 30mA sensitivity is appropriate for the intended level of personnel protection
• Confirm that your installation includes equipment that requires Type F protection, such as inverters or frequency converters
• Check the available space on the DIN rail within your distribution board

Usage recommendations

Regularly press the test button at least every six months to ensure the internal mechanism remains functional and the device trips as expected.