Hager CFA440D residual current circuit breaker 40 A 230/400 V 4-pole

The Hager CFA440D four-pole residual current circuit breaker is designed for electrical safety and protection against earth leakage currents in residential, commercial, and industrial electrical distribution boards. Featuring an input current of 40 A and supporting an input voltage of 230/400 V with a 300 mA sensitivity Type A rating, this modular device safeguards electrical circuits from faults. It complies with EN 61008-1, DIN EN 61008-2-1, and VDE 0664 standards, ensuring reliable operation and enhanced safety for modern power distribution systems.

Advantages

This residual current circuit breaker offers dependable protection against earth leakage currents, helping to prevent electrical hazards and equipment damage. It features IP2x touch protection according to DIN VDE 0106 Part 100 for safer handling during installation and maintenance. The device allows for the tool-free retrofitting of additional auxiliary equipment, improving setup flexibility. BiConnect terminals at the bottom and wire-insertion protection terminals ensure secure and straightforward cable connections. An external blue test button allows for quick functional verification, and direct labeling space on the housing facilitates clear circuit identification.

Suitable for

• Residential electrical distribution boards
• Commercial building power systems
• Industrial electrical installations
• Protection against earth leakage currents
• Circuits requiring Type A residual current monitoring

When it may not be suitable

This device may not be suitable for installations requiring a lower leakage current sensitivity, such as 10 mA or 30 mA, since it features a 300 mA sensitivity rating intended for specific protection requirements. It is also not designed for direct use in circuits exceeding its 40 A rated current or incompatible voltage specifications.

Key specifications

• 4-pole configuration
• Rated current: 40 A
• Rated voltage: 230/400 V
• Residual current sensitivity: 300 mA, Type A
• Touch protection: IP2x
• Compliant with EN 61008-1, DIN EN 61008-2-1, VDE 0664

How to use

Installation should be performed by a qualified electrician in accordance with applicable electrical codes and safety standards. The device is mounted onto standard DIN rails within an electrical distribution board. Connect the supply and load cables securely to the appropriate terminals, utilizing the BiConnect bottom terminals and wire-insertion protection. After installation, test the device periodically using the external blue test button to verify correct mechanical and electrical operation.

What to consider before purchase

• Verify that the 40 A rated current and 230/400 V voltage match your system requirements
• Confirm that a 300 mA Type A residual current sensitivity aligns with your circuit protection needs
• Ensure compatibility with existing distribution board space and mounting rails
• Check local electrical regulations regarding the use of residual current devices

Usage recommendations

Regularly test the residual current circuit breaker using the external blue test button to ensure ongoing operational reliability. Periodically inspect terminal connections and the overall physical condition of the device during routine electrical maintenance checks.