The Outdoor Dropout Fuse Tube is an essential component of drop-out fuse cutouts, specially designed to house and securely fix high-voltage fuse links inside the tube body. It provides a stable installation chamber to ensure accurate positioning and reliable fastening of the fuse link during operation. Manufactured from high-strength insulating materials, the fuse tube integrates arc extinguishing, insulation protection, mechanical operation, and weather resistance functions, ensuring safe and reliable performance in outdoor power distribution systems. After fuse operation, the tube automatically drops down to create a clearly visible disconnect point, improving maintenance safety and fault identification efficiency.
Hebei Fortis Technology Co., Ltd Product Brochure
Product Advantages
1.Secure Fuse Link Installation
The internal structure is designed to firmly hold and accurately position the high-voltage fuse link, ensuring stable installation and reliable operation.
2.Efficient Arc Extinguishing Performance
When the fuse link melts, the arc generated inside the tube causes the special gas-generating insulating material to release large amounts of gas, which quickly extinguishes the arc and interrupts the fault current.
3.Reliable Insulation Protection
Made of high-strength insulating materials, the fuse tube effectively isolates phase-to-phase and phase-to-ground voltage, reducing the risk of flashover, leakage, and short circuits.
4.Automatic Dropout Mechanism
Under normal conditions, the fuse link tension keeps the fuse tube in the closed position. After fuse operation, the loss of tension causes the tube to automatically drop downward under gravity and spring force, creating a clear visible disconnect point for safer maintenance and inspection.
5.Excellent Weather Resistance
The enclosure protects the internal fuse link from rain, sunlight, dust, corrosion, and other harsh outdoor environmental conditions, ensuring dependable long-term performance.
6.Stable Current Carrying Capability
The upper and lower terminal contact structure provides a stable conductive path during normal operation, allowing the fuse tube to safely carry the rated working current.
Application Scenarios
In rural electrification projects or urban fringe areas, the Complete Fuse Assembly is most commonly installed on the primary side of 11kV or 33kV pole-mounted transformers. When a transformer experiences an internal winding fault or core failure, this dropout fuse assembly instantly detects the overcurrent, melts the calibrated element, and mechanically releases the tube to fall open under gravity. This provides visible break protection for linemen and isolates the faulty transformer from the main feeder line, preventing cascading outages for hundreds of households.
For protecting lateral branch lines that tap off from main transmission trunks, this fuse cutout assembly acts as the first line of defense. In a typical configuration, a 33kV rated complete fuse assembly is installed at the branch point. If a tree falls on the branch line or a vehicle hits a pole downstream, the assembly interrupts the fault current before it affects the main grid. Unlike reclosers, this economical solution requires no auxiliary power, making it the preferred choice for long, rural overhead line branches with low load density.
Power factor correction banks located on distribution poles often require protection against internal capacitor element breakdown. The complete fuse assembly is matched specifically to the inrush current and discharge characteristics of capacitors. When a capacitor unit fails short-circuit, the fuse's fast-clearing expulsion design vents ionized gases downward (away from live parts), safely disconnecting the faulty can. This prevents the risk of case rupture or dielectric fluid leakage that could contaminate the surrounding environment.
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Add.: No.8-1, Zhenxing Street, Matun Town, Zaoqiang County, Hengshui City, Hebei Province
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