Overcurrent circuit breaker, 6kA BKJ63Nd series 2P 40A characteristic D BKJ63Nd 2P D40 BKJ63ND 2P D40

Overcurrent circuit breakers BKJ63Nd series – reliable installation protection

This two-pole overcurrent circuit breaker BKJ63Nd with a rated current of 40A and D characteristic is a key element of every safe electrical installation. It provides effective protection against overloads and short circuits, protecting both devices and the electrical installation. This is particularly important in circuits powering devices with high power consumption or with motors, where high inrush currents occur.

Design and application

The BKJ63Nd circuit breaker is designed for mounting on a 35mm DIN rail, which facilitates its installation and replacement. 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 wires with a cross-section of up to 25mm², ensuring a solid and safe connection. These circuit breakers are used in a wide range of installations – from domestic to industrial, where high reliability and safety are required.

Characteristics and parameters

Characteristic D means that the circuit breaker has a delayed response to short-term overloads, allowing it to handle devices generating high surge currents during start-up (e.g. motors, transformers) without problems. The rated current of 40A makes it an ideal choice for protecting circuits with medium load. The circuit breaker meets the requirements of IEC 60898-1 and IEC 60947-2 standards, which guarantees its compliance with European safety standards. The rated short-circuit breaking capacity is 6kA at 240/415VAC, which ensures effective disconnection of the circuit in the event of a short circuit. Additionally, the circuit breaker is characterized by high electrical durability (10,000 cycles) and mechanical durability (20,000 cycles), which translates into long and trouble-free operation.