Overcurrent circuit breaker, 6kA BKJ63Nd series 4P 20A B characteristic BKJ63Nd 4P B20 BKJ63ND 4P B20

Overcurrent circuit breakers BKJ63Nd – reliable installation protection

This four-pole overcurrent circuit breaker from the BKJ63Nd series, with a rated current of 20A and B characteristic, is a key element of every safe electrical installation. Designed to protect circuits against overload and short circuit, it ensures stable system operation and minimizes the risk of failure. It is a solution for both professional installers and end-users looking for reliable protection.

Construction and application

The BKJ63Nd circuit breaker is designed for mounting on a 35mm DIN rail. Its compact dimensions (17.8mm wide per pole) allow for efficient use of space in the distribution board. The use of lug terminals allows connection of conductors with a cross-section of up to 25mm², which ensures convenience and safety during installation. These circuit breakers are used in building installations, both residential and commercial, protecting lighting circuits, socket circuits and other electrical loads.

Key features and benefits

• High breaking capacity: Breaking capacity of 6kA (at 240/415VAC) guarantees effective protection of the installation in the event of serious disturbances.
• B characteristic: B characteristic means that the circuit breaker reacts quickly to an increase in short-circuit current, but is more tolerant to short-term inrush currents, which is important when connecting devices with motors or other inductive loads. This avoids unnecessary tripping of the circuit breaker during normal operation of devices.
• Durable construction: The circuit breaker is designed for long-term operation – it withstands 10,000 electrical operating cycles and 20,000 mechanical cycles.
• Compliance with standards: Meets the requirements of IEC 60898-1 and IEC 60947-2 standards, which confirms its safety and reliability.
• Wide range of rated voltages: The ability to operate at 240/415VAC (depending on the number of poles) increases the versatility of application.
• Overload and short circuit protection: Provides comprehensive protection of the electrical installation against the effects of overloads and short circuits – as expected from a circuit breaker of this type.
• DIN rail mounting: Quick and easy mounting on a standard 35mm DIN rail saves time during installation.