Hager CDA240J Residual Current Circuit Breaker 2P 40A 30mA Type A

The Hager CDA240J is a high-quality 2-pole residual current circuit breaker (RCCB) engineered to provide reliable electrical safety in various environments. This device is designed to monitor electrical circuits and automatically disconnect power when a residual current is detected, effectively preventing electric shocks and mitigating fire risks. With a rated current of 40A and a sensitivity of 30mA, it serves as a critical component in modern electrical distribution systems, ensuring compliance with safety standards in both residential and commercial buildings.

Advantages

The primary advantage of the Hager CDA240J is its Type A classification, which allows it to detect not only standard AC residual currents but also pulsating DC residual currents. This makes it a versatile and safer choice compared to standard AC-type breakers, especially in modern homes equipped with electronic devices like LED drivers, induction hobs, or washing machines. Its robust construction ensures long-term durability and consistent performance, providing peace of mind for installers and end-users alike.

Suitable for

• Residential electrical distribution boards
• Commercial office installations
• Protection of circuits with electronic components
• General household appliance safety

When it may not be suitable

This device is not intended for use in circuits requiring higher current ratings than 40A or higher sensitivity levels. It is also not suitable for DC-only systems or specialized industrial applications that require Type B residual current protection.

Key specifications

• Number of poles: 2
• Rated current: 40A
• Residual current sensitivity: 30mA
• Type: A (AC and pulsating DC)
• Mounting type: DIN rail

How to use

The Hager CDA240J must be installed by a qualified electrician in accordance with local electrical regulations. It is designed for mounting onto a standard DIN rail within a distribution board. Once installed, the device should be connected to the incoming phase and neutral lines. Regular testing using the integrated test button is essential to ensure the mechanical integrity of the tripping mechanism.

What to consider before purchase

• Verify that the 40A rating is sufficient for your circuit load
• Ensure the installation environment is compatible with DIN rail mounting
• Check if your local regulations require Type A protection for your specific appliances

Usage recommendations

It is recommended to perform a manual test of the residual current circuit breaker at least every six months by pressing the test button to ensure the device remains operational and responsive to fault conditions.