Product Overview

The FKN12 - 12D pneumatic load break switch (hereinafter referred to as the load break switch) is an indoor high - voltage switching device for three - phase AC 12kV, 50/60Hz. Under normal circuit conditions, it can close, carry and open load current; it can close short - circuit current and has the ability to carry short - circuit current within a specified time. After the load break switch is equipped with a current - limiting fuse with an impactor, it becomes a load break switch - fuse combined electrical appliance (hereinafter referred to as the combined electrical appliance), which can be used for overload and short - circuit protection of loads (such as power transformers).

This product is suitable for installation in ring main unit switch cabinets, box - type substations and other types of switch cabinets. It is an ideal equipment for the construction, transformation and renewal of current distribution networks, transformation and distribution substations and switch stations.

Key Features

Current Handling Capability：Under normal operation, it can smoothly close, carry, and interrupt load current; in the event of a short - circuit fault, it is capable of closing short - circuit current and carrying short - circuit current within the specified time, ensuring short - term stability of the power grid during faults and gaining time for fault elimination.

Combined Protection Feature：When combined with a current - limiting fuse with an impactor, it forms a load break switch - fuse combination electrical appliance, providing overload and short - circuit protection for loads such as power transformers. This simplifies the system protection configuration and enhances the timeliness and effectiveness of protection.

Compact Structure：Based on the pneumatic arc - extinguishing principle, the overall structure is exquisitely designed with a small footprint, suitable for installation in indoor switchgear with limited space.

Flexible Installation：It has strong compatibility with various types of switchgear such as ring main unit switchgear and box - type substations. It can be conveniently installed in both new construction and renovation projects, reducing construction difficulty and costs.

Technical Parameters

Mechanical Characteristics

Operating Environmental Conditions

•  Altitude: Not exceeding 1000m;

•  Ambient Temperature: Maximum +40°C, Minimum -25°C;

• Relative Humidity: Daily average not exceeding 95%, Monthly average not exceeding 90%;

• Seismic Intensity: Below 8 degrees;

• This switch should be installed in places free from fire, explosion hazards, severe pollution, chemical corrosion, and violent vibration.