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China FN7-12 Series Indoor High Voltage Load Switch and Fuse Combination - Reliable Suppliers & Factory
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China FN7-12 Series Indoor High Voltage Load Switch and Fuse Combination - Reliable Suppliers & Factory

Introducing the FN7-12 Series, a state-of-the-art indoor AC high voltage load switch specifically designed for 12kV, 50Hz systems. This high-performance switch is capable of breaking load currents and making short-circuit currents, ensuring reliable operation in various conditions. Equipped with a fuse, it effectively interrupts any current, providing comprehensive protection for transformers and power lines. Rated for extreme conditions as low as -40℃, this compact design delivers dependable circuit control, making it an ideal choice for various applications. As a leading product from China, our FN7-12 Series load switch is trusted by many suppliers and manufactured in our state-of-the-art factory to meet the highest quality standards
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    Product Details

    Technical Specification

    Rated voltage (KV)

    12

    Insulation level

    1min frequency voltage (KV)

    Phase to phase, to earth 42

    Isolation fracture 48

    Lightning impulse withstand voltage (KV)

    Phase to phase, to earth 75

    Isolation fracture 85

    Rated current (A)

    400

    630

    4S Rated thermal current (KA)

    12.5

    20

    Rated active load breaking current (KA Peak)

    31.5

    50

    Rated short circuit making current (KA peak)

    31.5

    50

    Item

    Model

    DS

    DX

    L

    R

    RA

    F

    Use

    Grounding switch incoming feeder side

    Grounding switch outgoing feeder side

    Interlock device

    Fuse

    Impact fuse

    Electric sub-gate devices

    Load Switches

    Non-impact fuse

    FN7-12

    -

    -

    -

    -

    -

    -

    Line load switch

    FN7-12DSL

    △

    -

    △

    -

    -

    -

    FN7-12DXL

    -

    △

    △

     

     

     

    FN7-12R

    -

    -

    -

    △

    -

    -

    Transformer Protection

    FN7-12DSLR

    △

    -

    △

    △

    -

    -

    FN7-12DXLR

    -

    △

    △

    △

    -

    -

    With impact fuse

    FN7-12RAF

    -

    -

    -

    -

    △

    △

    FN7-12DSLRAF

    △

    -

    △

    -

    △

    △

    FN7-12DXLRAF

    -

    △

    △

    -

    △

    △
    Dimension
    FN7-12 Load Switch Dimension Drawing
    Frequently Asked Questions
    Q What is the rated voltage of the FN7-12 load switch?
    The FN7-12 series load switch has a rated voltage of 12 KV, making it suitable for medium-voltage distribution networks operating within this voltage class.
    Q What rated current options are available for the FN7-12 load switch?
    The FN7-12 load switch is available in two rated current options: 400 A and 630 A, allowing selection based on the specific load requirements of your application.
    Q What is the lightning impulse withstand voltage of the FN7-12 series?
    The lightning impulse withstand voltage is 75 KV for phase-to-phase and phase-to-earth, and 85 KV across the isolation fracture, ensuring reliable protection against transient overvoltages.
    Q What is the difference between FN7-12 models with and without impact fuse?
    Models without impact fuse (e.g., FN7-12, FN7-12DSL, FN7-12R) are typically used for line load switching or basic transformer protection. Models with impact fuse (e.g., FN7-12RAF, FN7-12DSLRAF) incorporate an impact fuse and electric sub-gate device, providing enhanced transformer protection by automatically tripping the switch upon fuse operation.
    Q What do the DS and DX suffixes indicate in the FN7-12 model nomenclature?
    The suffix DS indicates that the model is equipped with a grounding switch on the incoming feeder side, while DX indicates a grounding switch on the outgoing feeder side. These configurations provide safe earthing options for maintenance and operational safety.
    Q What are the main application scenarios for the FN7-12 load switch series?
    The FN7-12 series is designed for two primary application scenarios: line load switching (suitable for ring main units and feeder automation) and transformer protection (used in combination with fuses to safeguard distribution transformers from overloads and short-circuit faults).