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China FN5-12 Series Indoor High Voltage Load Switch-Fuse Combination - Reliable Suppliers & Factory Solutions
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China FN5-12 Series Indoor High Voltage Load Switch-Fuse Combination - Reliable Suppliers & Factory Solutions

The FN5-12 Series is an innovative indoor AC high voltage load switch-fuse combination device, tailored for 6-12kV distribution systems. Manufactured by leading suppliers in China, this compact and lightweight apparatus utilizes cutting-edge international technology to effectively interrupt load currents, overload currents, and short-circuit currents. With three operational positions—make, break, and earth—it is perfectly suited for ring main units and prefabricated substations. Compliance with IEC420 and GB3804 standards ensures its reliability and safety. This factory-produced solution not only provides robust protection for transformers and power lines but also allows for space-efficient installation, making it an ideal choice for modern electrical distribution networks
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    Product Details

    Technical Specification

    Rated voltage KV

    1min frequency voltage KV

    Rated Current A

    4S thermal current A

    Dynamic current (peak) KA

    Rated breaking current A

    Short circuit close current KA

    12

    42

    400

    12.5

    31.5

    400

    31.5

    48

    630

    20

    50

    630

    50
    Fuse Ratings

    Model

    Rated voltage (KV)

    Rated current (A)

    Fondant rated current (A)

    SDLA*J

    12

    50

    6.3, 10, 16, 20, 25, 31.5, 40

    SFLA*J

    12

    100

    50, 63, 71, 80, 100

    SKLA*J

    12

    125

    125
    Product Model
    Product Model Diagram
    Dimension
    Dimension Drawing
    Frequently Asked Questions
    Q What is the rated voltage of this load break switch?
    The rated voltage of this load break switch is 12 KV, making it suitable for medium-voltage power distribution systems and applications requiring reliable switching performance at this voltage level.
    Q What rated current options are available?
    The switch is available in two rated current options: 400 A and 630 A, allowing flexibility for different load requirements in medium-voltage distribution networks.
    Q What fuse models are compatible with this switch?
    Three fuse models are compatible: SDLA*J (rated 50 A, fondant current 6.3–40 A), SFLA*J (rated 100 A, fondant current 50–100 A), and SKLA*J (rated 125 A, fondant current 125 A). All are rated at 12 KV.
    Q What is the short circuit closing current capacity?
    The short circuit closing current capacity is 31.5 KA for the 400 A variant and 50 KA for the 630 A variant, ensuring robust performance under fault conditions.
    Q What is the 1-minute power frequency withstand voltage?
    The 1-minute power frequency withstand voltage is 42 KV for the 400 A configuration and 48 KV for the 630 A configuration, demonstrating strong insulation performance for safe medium-voltage operation.
    Q What is the 4-second thermal current rating?
    The 4-second thermal current rating is 12.5 KA for the 400 A model and 20 KA for the 630 A model. This indicates the switch's ability to withstand short-duration fault currents without damage.