Zhejiang Donghua Electrical Appliance Co., Ltd.
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FN5‑12 Indoor High‑Voltage Combined Apparatus of Load Switch and Fuse

FN3‑12 Indoor High‑Voltage Load Switch

General Description

The FN5‑12R(L) indoor AC high‑voltage load‑switch‑fuse combined apparatus has passed comprehensive type‑tests and long‑term operational assessments. Its performance complies with IEC 420 (1990 edition) 《Alternating‑current high‑voltage load‑switch‑fuse combination apparatus》 and GB 3804 《3‑63kV Alternating‑current High‑Voltage Load Switches》. Compared with similar foreign products, its technical parameters have reached the level of equivalent overseas products. It features compact size and light weight.

It is applicable for ring main units and box‑type substations, widely used for power distribution in 10 kV lines. It realizes three working positions: switching, isolation and earthing, and effectively prevents the equipment from operating under phase‑defect conditions.

    Preview Data Contact us
    Outline and Installation Dimension Drawing
    Outline and Installation Dimension Drawing

    1. Main Specifications

    Rated Voltage (kV) 1 min Power Frequency Withstand Voltage (kV) Rated Current (A) 4s Thermal Withstand Current (kA) Rated Short-Time Withstand Current (Peak) (kA) Rated Making Current (Peak) (kA) Rated Short-Circuit Closing Current (kA)
    12 42 42 12.5 31.5 400 31.5
    12 48 48 20 50 630 50

    2. Fuse Rated Parameters

    Model Rated Voltage (kV) Rated Current (A) Fuse Link 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

    PART 1

    1. Base frame 
    2. Insulator 
    3. Fuse tube 
    4. Trip device 
    5. Moving contact 
    6. Arc‑extinguishing tube 
    7. Guide plate 
    8. Static contact 
    9. Closing‑opening mechanism 
    10. Interlock device 
    11. Load‑switch operating mechanism 
    12. Earthing switch 

    PART 2

    1. Load switch 
    2. Bent connector 
    3. 3/4"welded steel pipe (Customer‑supplied) 
    4. Operating mechanism