Residual current circuit breaker 3P+N 40A 30mA 10kA B+ CDB640D

Safety and protection in your electrical installation

Hager CDB640D residual current circuit breaker is a key element ensuring the safety of using the electrical installation. The device is designed to protect people from electric shock and to protect circuits against the effects of short circuits and overloads. This model, with a rated current of 40A and a sensitivity of 30mA, is perfect for home installations as well as for public utility facilities. The short-circuit breaking capacity at 10kA guarantees an effective response in the event of a failure.

Construction and application

The 3P+N Hager CDB640D residual current circuit breaker is mounted on a DIN rail, which facilitates its installation and replacement. Designed to operate at AC 400V, it has four poles (3 phase + neutral), making it an ideal solution for three-phase circuits. Characteristic B+ provides a quick response to leakage currents, while allowing for short-term overloads without unnecessary tripping of the circuit – useful, for example, when starting motors. The use of this circuit breaker minimizes the risk of electric shock and equipment damage.

Key features and benefits

• High protection efficiency: Rated differential current of 30mA ensures quick detection of leakage current and immediate disconnection of the circuit, protecting users from electric shock.
• Wide range of applications: Suitable for protecting circuits with a rated current of up to 40A in AC 400V installations.
• Solid construction: Made of high-quality materials, guarantees reliable operation for a long time. Protection class IP20 provides protection against touching with fingers and against the ingress of solid objects larger than 12.5 mm.
• Easy installation: DIN rail mounting simplifies and speeds up installation and replacement of the device. A width of 4 modules allows for efficient use of space in the switchgear cabinet.
• Mechanical lock: Provides additional safety, preventing accidental switching off or on of the circuit breaker.
• Resistance to external conditions: Adapted to work in temperatures from -25°C to 70°C, which allows it to be used in various environmental conditions.
• Compliance with standards: Meets the requirements of EN 61008-1 and VDE 0664-400 standards, which confirms its safety and quality.
• Wire cross-sections: Possibility of connecting solid wires with a cross-section from 1 to 25 mm² and stranded wires from 1 to 16 mm².
• Power losses: Low power losses of only 6.77W contribute to energy savings.