ABB BKH 2P D63A Miniature Circuit Breaker, 63A, 10kA, D-Curve

The ABB BKH 2P D63A is a high-performance miniature circuit breaker engineered to provide robust protection for electrical circuits in demanding environments. This 2-pole device is specifically designed to handle significant electrical loads, offering a rated current of 63A and a substantial breaking capacity of 10kA. By utilizing a D-type tripping characteristic, this circuit breaker effectively manages high inrush currents, making it a reliable component for maintaining safety and operational continuity in electrical distribution systems.

Advantages

This circuit breaker stands out due to its superior build quality and ability to withstand high surge currents without nuisance tripping. The D-curve characteristic ensures that the device remains stable during the startup phase of inductive loads, such as motors or transformers, which typically draw large amounts of power momentarily. Its 2-pole configuration allows for the simultaneous disconnection of both phases, providing an essential layer of safety for complex electrical installations and preventing damage from overloads or short circuits.

Suitable for

• Industrial machinery and motor control centers
• Commercial electrical distribution boards
• Systems with high-inrush current equipment
• Large-scale lighting installations
• HVAC systems and industrial pumps

When it may not be suitable

This device is not intended for residential applications where standard B or C curve breakers are typically sufficient. Using a D-curve breaker in circuits without high inrush currents may result in delayed protection during a fault, as the trip threshold is specifically calibrated for inductive loads.

Key specifications

• Rated current: 63A
• Number of poles: 2
• Breaking capacity: 10kA
• Tripping characteristic: D-curve
• Mounting type: DIN rail

How to use

The ABB BKH 2P D63A is designed for installation on a standard DIN rail within an electrical distribution panel. Installation should be performed by a qualified electrician to ensure all connections are secure and comply with local electrical codes. The device is snapped onto the rail, and the supply and load cables are connected to the respective terminals, ensuring proper torque is applied to the screws to prevent overheating.

What to consider before purchase

• Verify that the D-curve characteristic matches the requirements of your connected equipment
• Ensure the 63A rating is appropriate for your circuit load and cable cross-section
• Confirm that the 10kA breaking capacity meets the short-circuit current rating of your installation site
• Check the available space in your distribution board for a 2-pole module

Usage recommendations

Regular inspection of the terminal connections and periodic testing of the tripping mechanism are recommended to ensure long-term reliability and safety of the electrical system.