Residual current circuit breaker 3P+N 40A 300mA 6kA Type A CFA440J

Residual Current Device (RCD) 3P+N 40A is a key element ensuring safety in electrical installations. The device is designed to protect people and equipment from electric shock, as well as the effects of short circuits and overloads. This model, designated CFA440J, finds wide application in both domestic, industrial and commercial installations.

Functionality and application

This RCD monitors the continuous flow of current in the circuit and, in the event of a difference between the phase and neutral currents (leakage current), immediately disconnects the circuit. This minimizes the risk of users being shocked and damage to connected devices. The 3P+N construction (three phase poles + neutral pole) makes it ideal for protecting three-phase circuits. The rated current of 40A allows for the safe power supply of most standard energy consumers in residential and public buildings.

Characteristics and installation

Installation is carried out on a standard DIN rail, which facilitates integration with existing electrical distribution boards. The width of the device, 4 modules, allows for efficient use of space in the distribution cabinet. Made of high-quality materials, the RCD ensures reliable operation even in difficult environmental conditions – from -25°C to 40°C. The IP20 degree of protection guarantees protection against touching with fingers and against the ingress of solid objects larger than 12.5 mm.

Key product features

• High breaking capacity: 6kA – ensures effective protection of the installation in the event of a short circuit.
• Rated current 40A: allows securing circuits with medium power consumption.
• Sensitivity A (300mA): dedicated to detecting leakage currents resulting from, for example, damage to cable or device insulation.
• DIN rail mounting: facilitates and speeds up installation and device replacement.
• Width 4 modules: optimal use of space in the distribution board.
• Rated impulse withstand voltage Uimp: 4kV – increased resistance to overvoltages.
• Wire cross-section: possibility of connecting solid wires with a cross-section of 1-25 mm² and stranded wires with a cross-section of 1-16 mm².

This residual current device is a reliable solution for anyone who cares about the safety of their electrical installation and comfort of use. Its solid construction and high technical parameters guarantee long-term and trouble-free operation.