Overcurrent circuit breaker, 6kA BKJ63Nd series 3P 40A characteristic B BKJ63Nd 3P B40 BKJ63ND 3P B40

Overcurrent circuit breaker BKJ63Nd 3P 40A is a safety element protecting the electrical installation against overloads and short circuits. Designed for mounting on a 35mm DIN rail, it is a reliable solution for both installers and end users. This three-pole circuit breaker with a rated current of 40A is characterized by high efficiency and durability.

Characteristics and application

The BKJ63Nd circuit breaker with characteristic B provides a quick response to current increase, which is particularly important in circuits with devices with high power consumption at start-up, e.g. motors. Characteristic B means that the circuit breaker reacts quickly to short-circuit current, but tolerates short-term overloads that may occur during device start-up. This minimizes the risk of unnecessary circuit tripping. It is ideal for protecting lighting, socket outlets, and residential and commercial circuits. Use in electrical installations guarantees protection against damage to wires and devices.

Construction and parameters

The circuit breaker construction is based on solid materials, ensuring long-lasting and reliable operation. The ability to connect wires with a cross-section of up to 25mm² provides flexibility in choosing the appropriate cables. The width of the circuit breaker is 17.8mm per pole, allowing for efficient use of space in the distribution board. The circuit breaker meets the requirements of IEC 60898-1 and IEC 60947-2 standards, confirming its safety and compliance with applicable standards. It has a short-circuit breaking capacity of up to 6kA at 240/415VAC – this is a key parameter determining its effectiveness in emergency situations. Electrical endurance is 10,000 operating cycles, and mechanical endurance as many as 20,000 cycles – which proves its durability and reliability in long-term use. The degree of protection IP20 provides protection against finger contact and against the ingress of solid objects larger than 12.5 mm.

Additional information

• BKJ63Nd circuit breakers are available in various pole versions (1P, 1P+N, 2P, 3P, 3P+N, 4P), allowing adaptation to specific installation needs.
• The possibility of mounting on a DIN rail facilitates and speeds up the installation process.
• A wide range of rated voltages (1P: 240/415VAC; 1P+N: 240VAC; 2~4P: 415VAC) makes it suitable for various applications.
• The ambient operating temperature is in the range of -5°C to +40°C – which guarantees correct operation in typical operating conditions.
• Available accessories (AX, AL, SHT, OVT, UVT) allow expanding the functionality of the circuit breaker and adapting it to specific installation requirements.