Residual current circuit breaker 3P+N 40A 300mA 10kA B+ CFB640D

3P+N Residual Current Circuit Breaker – reliable installation protection

This three-pole residual current circuit breaker (3P+N) with a rated current of 40A and a sensitivity of 300mA is a key safety element in any electrical installation. Designed by Hager, model CFB640D provides effective protection against electric shock and damage caused by short circuits and overloads. Its design and parameters make it a suitable solution for both home and commercial installations.

Functionality and application

Type B+ residual current circuit breaker is particularly recommended for use in circuits powering devices generating harmonic disturbances, such as inverters or switch-mode power supplies. The B+ characteristic allows for correct operation in the event of leakage currents with a complex waveform, ensuring reliable protection of people and equipment. Mounting is on a DIN rail, which facilitates integration with the existing distribution board. Designed to operate at 400V and 50Hz.

Key features and benefits

• High breaking capacity: 10kA ensures a quick response in the event of a short circuit, minimizing the risk of damage.
• Wide operating temperature range: from -25°C to 70°C enables use in various environmental conditions.
• Mechanical lock: prevents accidental disconnection of the circuit breaker, increasing safety.
• Universal connection terminals: possibility of connecting solid conductors (1-25 mm²) and stranded conductors (1-16 mm²).
• Compact dimensions: width of 4 modules makes it easy to install even in limited space of the distribution board.
• Compliance with standards: meets the requirements of EN 61008-1 and VDE 0664-400 standards, guaranteeing safety and reliability.
• IP20 degree of protection marking: provides protection against touching with fingers and against the ingress of solid objects larger than 12.5 mm.
• Impulse withstand: the impulse withstand is as high as 5kA, which translates to a longer device life.

Installation and compatibility

Installation of the CFB640D residual current circuit breaker is simple and intuitive thanks to the standard mounting on a DIN rail. Screw terminals ensure a secure connection of the conductors. Compatible with DIN rails, which facilitates integration with the existing electrical infrastructure. It is important to select the correct preliminary protection (e.g. overcurrent circuit breaker) to ensure optimal installation protection.