Overcurrent circuit breaker, 6kA series BKJ63Nd 4P 63A characteristic B BKJ63Nd 4P B63 BKJ63ND 4P B63

Overcurrent circuit breaker BKJ63Nd is an element used to protect electrical installations from the effects of overloads and short circuits. Model 4P 63A with characteristic B is a popular solution for both home and commercial installations. It is used wherever reliable protection of electrical circuits is required.

Characteristics and application

BKJ63Nd series circuit breakers are an improved version of the previous BKN series – they maintain functionality but offer improved technical parameters. A key change is the use of a separate terminal for the wire and the busbar, which simplifies installation and ensures a secure connection. They are designed to protect electrical installations in residential and industrial buildings. Thanks to their construction and parameters, these circuit breakers provide effective protection against damage caused by overloads or short circuits in the circuit.

Construction and product features

The BKJ63Nd 4P B63A circuit breaker is characterized by a solid construction and compact dimensions. It is mounted on a standard 35mm DIN rail. It has 4 poles, which means it protects all phase conductors in the circuit. Characteristic B indicates a quick response to an increase in short-circuit current, which is particularly important for inductive loads (e.g., motors). The rated breaking current (6kA) ensures effective disconnection of the circuit in the event of a short circuit. The circuit breaker meets the requirements of IEC 60898-1 and IEC 60947-2 standards, which confirms its safety and reliability.

• This circuit breaker allows you to protect circuits with higher power consumption, with a maximum current of 63A. Fast reaction to short-term overloads and short circuits, thanks to characteristic B, protects connected devices – especially those of an inductive nature such as motors or transformers.
• Four-pole (4P) construction provides complete circuit protection by simultaneously disconnecting all phases.
• The ability to effectively interrupt a short-circuit circuit with an energy of up to 6kA guarantees the safety of the electrical installation.
• Mounting on a standard 35mm DIN rail facilitates quick and safe installation in a distribution board.
• The circuit breaker maintains its properties over a wide range of ambient temperatures, from -5°C to +40°C, making it a universal solution.
• Protection class IP20 protects against finger contact and access to hazardous live parts, increasing safety.

It is important to choose the correct circuit breaker characteristic for the type of load – characteristic B is recommended for circuits with devices with a high starting current (e.g., motors, transformers).