EC Insulator Jiangxi Co., Ltd. is one of the most reliable manufacturers and suppliers of outdoor drop out fuse in China. With abundant experience, we are committed to offering high quality custom service. Please feel free to wholesale premium outdoor drop out fuse made in China here from our factory.
Brief Introduction
The outdoor drop out fuse is a standard overcurrent protection component installed on pole mounted overhead distribution lines across Latin American power projects. When a line overload or short circuit current reaches the preset threshold, this outdoor drop out fuse trips automatically and drops the insulating tube down, giving line maintenance staff a clear visual fault signal from the ground without needing to climb the pole immediately. Many distribution contractors and local power utilities choose this outdoor drop out fuse because it requires no complex sealing structure, and replacement work can be finished with basic hot line tools during scheduled maintenance windows. We supply two major housing versions including composite silicone rubber type and traditional porcelain type, with rich model options covering 15kV, 27kV and 36kV /38kV grades for most secondary distribution network designs.
How It Works
Once the fuse element inside the tube melts under fault current, the built in gas generating material releases high pressure gas to blow the arc out quickly. The whole interruption process finishes in tens of milliseconds, before the fault current can cause damage to downstream transformer windings or cable insulation. After tripping, the lower end of the insulating tube hangs down at a visible angle, so patrol staff can identify the faulty line section from the road below within a few minutes. We adjust the length of the gas release channel for different voltage levels, to make sure the arc is fully extinguished without causing surface flashover on the outer housing.
Product Series & Technical Parameters
We maintain two separate product lines for customer selection. The HRW series uses composite silicone rubber housing. Common models are HRW 15/100(200)-10, HRW 27/100(200)-10 and HRW 36/100(200)-8. Their rated continuous current supports both 100A and 200A. The minimum creepage distance ranges from 370 mm up to 1080 mm, and power frequency withstand voltage reaches 40kV to 75kV according to voltage class. The RW series adopts porcelain housing. Representative models cover RW 15, RW 27 and RW 38. This series is widely picked for projects with stable budget and classic design requirements. Breaking current varies from 8kA to 12kA, and BIL impulse voltage covers 110kV to 170kV. All models have passed corresponding power frequency voltage and lightning impulse tests before leaving our factory.
Common Site Applications
We have supplied units for three main project types in recent years. The first is pole mounted transformer protection, where the unit is installed on the cross arm right next to the distribution transformer to cut off fault current before the transformer is damaged. The second is overhead line branch protection, used to isolate fault sections on long suburban feeders that run through farmland and residential neighborhoods. The third is coastal and high dust area projects. The silicone rubber variant delivers stronger performance against salt spray and industrial dust than porcelain options, cutting annual maintenance inspection frequency by almost half for local utilities. Porcelain versions are more favored in inland dry zones for stable long term operation.
Practical Product Details
Composite silicone rubber housing resists ultraviolet aging, and works steadily within ambient temperature from minus 40 degrees Celsius to 55 degrees Celsius. Porcelain housing features great surface hydrophobic property and low leakage risk under light pollution conditions. All conductive metal parts are hot dip galvanized. The internal fuse link can be replaced separately, so customers do not need to buy a whole new unit every time a fault trips the fuse. Each unit comes with matching mounting bolts and connection clamps, so site crews do not need to prepare extra fasteners during installation.
Custom Order Support
We adjust product details to match each customer's project requirements. We can print customer logos and project identification numbers on the housing for tender projects. We also provide Spanish or Portuguese installation sheets for customers in Colombia, Brazil and Chile, to help their local crews finish installation correctly. If your project requires special connection size to fit existing pole brackets, our engineering team will review the drawing and send back a modified sample within 10 working days. Non standard voltage ratings can also be developed after technical discussion.
Order & Shipment Notes
We keep regular stock of mainstream 27kV models in our warehouse, so small trial orders can be dispatched within 7 working days. Custom non stock orders usually take 20 to 25 days to finish production before delivery. Standard packing uses fumigation free wooden cases, with 6 units packed in each case to avoid collision during sea freight. We can load units together with insulators and surge arresters in the same 40HQ container, to help customers save total freight cost. All shipments come with commercial invoice, packing list and factory test report, with actual measured leakage current and power frequency withstand values listed for each batch.
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