Residual current circuit breaker 40A, 30mA, 4-pole, type A CDA440J

Safety and reliability in your electrical installation

Four-pole residual current circuit breaker with a rated current of 40A and a sensitivity of 30mA is a key element ensuring the protection of people and equipment against electric shock and the effects of short circuits. The device is designed for use in three-phase installations, offering comprehensive protection of circuits. Its type A construction guarantees proper operation with both sinusoidal and pulsating currents with a DC component, making it an ideal solution for modern electrical installations.

Functionality and technical parameters

The circuit breaker has been designed with ease of mounting on a DIN rail in mind. The rated switching voltage is 400V, and the insulation voltage Ui reaches 500V, ensuring safe and reliable operation in various conditions. The short-circuit breaking capacity at 6kA guarantees an effective response in the event of a failure. The width of the device, 4 modules, allows for efficient use of space in the switchgear. The cross-section of the conductors connected to the circuit breaker can range from 1mm² to 25mm² (solid) or from 1mm² to 16mm² (stranded).

Comfort of use and additional functions

The CDA440J residual current circuit breaker stands out with a number of features that facilitate its operation. It has an optical trip indicator, which allows for quick identification of the cause of tripping - whether it was a differential current or manual disconnection. In addition, the device is equipped with protection against contact (IP2x), even when using phase rails, and terminal covers minimizing the risk of incorrect wiring. The possibility of using vertical comb busbars (in the case of 4-pole circuit breakers) facilitates connection with other devices in the switchgear. This makes the installation more transparent and easier to service.

• Wide range of applications: ideal for homes, offices and industrial facilities.
• High quality workmanship: guarantees reliable operation and long life.
• Compliance with standards: ensures safety and meets European requirements (EN 61008-1).
• Easy installation: thanks to the DIN rail construction and clear terminals.
• Trip indicator: facilitates fault diagnosis and quick power restoration.
• Touch protection: increases safety of use.
• Expandability: compatible with Hager accessories, such as additional trip units and auxiliary contacts.