Overcurrent circuit breaker, 6kA BKJ63Nd series 4P 25A characteristic B BKJ63Nd 4P B25 BKJ63ND 4P B25

Overcurrent circuit breaker BKJ63Nd 4P 25A is a reliable safety element protecting electrical installations against overloads and short circuits. Designed for both domestic and professional applications, it provides effective protection for devices and cables. Made of high-quality materials, it guarantees long-lasting and trouble-free operation.

Characteristics and application

This four-pole circuit breaker with B characteristic and a rated current of 25A is ideal for protecting circuits with a resistive-inductive nature. This means it works well in installations powering lighting, electrical outlets, and low inrush current heating devices. The B characteristic provides a faster response to current increase than the C characteristic, which is important when protecting circuits sensitive to sudden voltage spikes. The breaking capacity of 6kA guarantees safety in the event of a short circuit.

Construction and installation

The BKJ63Nd circuit breaker is characterized by a compact design – its width is 17.8mm per pole, which allows for efficient use of space in the switchgear cabinet. Installation is done on a standard 35mm DIN rail, which simplifies and speeds up installation. It has universal terminals – both screw and lug – allowing the connection of cables with a cross-section of up to 25mm². This gives the installer more freedom in choosing the appropriate connectors. The circuit breaker is designed to operate in temperatures from -5°C to +40°C, making it suitable for most operating conditions.

Standards and parameters

The circuit breaker meets the requirements of IEC 60898-1 and IEC 60947-2 standards, confirming its compliance with European safety standards. Its electrical endurance is 10,000 operating cycles, guaranteeing a long service life. It should be remembered that the ambient temperature affects the rated current of the circuit breaker – at higher temperatures, the rated current may decrease (information about this effect can be found in the technical documentation). The use of two-pole terminals (lug & screw) provides flexibility during installation and connection of cables of different thicknesses.