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Drop-out fuses are the most widely used short-circuit protection devices for 10-38kV distribution line branch lines and distribution transformers. Unplanned outages caused by electrical faults can result in significant financial losses for utility companies, electrical contractors and facility managers. HAIVOL 21kV drop out fuse cutouts provide an economical, reliable and easy-to-operate solution for protecting overhead distribution systems and critical equipment. Designed specifically for harsh outdoor environments, our expulsion fuse cutouts are manufactured and tested in strict accordance with the latest international standards, ensuring consistent performance and long service life. They are ideal for primary side protection of distribution transformers, capacitor banks and sectionalizing of distribution networks.
Our 21kV overhead line fuses deliver tangible value to commercial and industrial clients by minimizing downtime, reducing maintenance costs and improving overall system reliability.
Reliable Short-Circuit Protection: With a 12kA rated interrupting capacity, our fuse cutouts effectively isolate faulty sections of the distribution network, preventing damage to expensive transformers and other equipment. The fuse tube automatically drops out when the fuse element melts, providing a visible indication of the fault location.
Low Total Ownership Cost: Our fuse cutouts offer an affordable initial investment combined with exceptional durability, resulting in significantly lower long-term costs compared to more complex protection devices.
Simplified Operation & Maintenance: Can be safely operated using a standard portable loadbreak tool, functioning much like an overhead line disconnect switch for routine maintenance procedures without requiring a full system shutdown.
Exceptional Environmental Adaptability: Engineered to withstand extreme temperatures, heavy rain, high winds and corrosive atmospheres, making them suitable for installation in rural, urban, industrial, coastal and high-altitude locations.
Rated voltage(KV) | Rated current(A) | Rated interrupting current(KA) | Lightning impulse withstand voltage to ground (BIL KV) | Minimum power frequency withstand dry voltage to ground (KV) | Minimum creepage distance(mm) |
|---|---|---|---|---|---|
11-15 | 100/200 | 12 | 110 | 42 | 220 |
11-15 | 100/200 | 12 | 125 | 50 | 320 |
24-27 | 100/200 | 12 | 150 | 65 | 470 |
33-38 | 100/200 | 8 | 170 | 70 | 660 |
33-38 | 100/200 | 8 | 170 | 70 | 720 |
33-38 | 100/200 | 8 | 170 | 70 | 900 |
 |  |  |  |  |  |
We offer two high-quality insulator options to meet the specific requirements of different installation environments:
Porcelain Insulators: The porcelain body is bonded to hardware fittings using Por-Rok anchoring cement manufactured by CGM INC from the USA. This premium cement provides rapid solidification, high mechanical strength, low expansion coefficient and exceptional weather aging resistance.
Polymer Insulators: Hardware fittings are crimped onto a high-strength fiberglass rod, with the housing and sheds made from high-temperature vulcanized silicone rubber. The one-piece injection molding process ensures excellent sealing performance and superior resistance to tracking and erosion, making them ideal for polluted and coastal areas.
Our fuse cutouts feature an innovative single vent design that directs exhaust gases downward and outward during interruption. This design:
Prevents rainwater intrusion into the fuse tube
Eliminates damage to upper line components from hot gases
Significantly improves overall interrupting capacity
All copper casting components are made from high-grade bronze or brass, providing excellent mechanical strength and electrical conductivity
All contact surfaces are silver-plated and feature a convex design to minimize contact resistance
High-strength memory copper alloy sheets ensure consistent low-resistance contact even after repeated operations
An optional arc-shortening copper rod is available to further enhance short-circuit interruption performance
All ferrous metal components undergo a rigorous hot-dip galvanizing process with a minimum zinc coating thickness of 86μm, providing long-lasting corrosion protection even in the harshest industrial and coastal environments.
Loadbreak type fuse cutouts are equipped with arc chambers made from special reinforced nylon material. This material offers excellent mechanical strength, anti-aging properties and flame retardancy, making them suitable for use in high ultraviolet, high altitude and coastal areas.
HAIVOL 21kV drop out fuse cutouts are suitable for a wide range of electrical distribution applications:
Primary side protection for distribution transformers (10-38kV)
Short-circuit protection for overhead distribution line branch lines
Capacitor bank protection
Sectionalizing device for distribution systems
Temporary power connections for construction sites and events
Rural electrification projects
At HAIVOL, quality is our top priority. All our expulsion fuse cutouts are manufactured and tested in accordance with the latest international standards: IEC 60282-2:2008, IEEE Std C37.41-2008 and IEEE Std C37.42-2009. We implement rigorous quality control processes at every stage of production, from raw material inspection to final product testing. Each unit undergoes comprehensive electrical and mechanical testing before shipment to ensure it meets our strict performance specifications. We stand behind the quality of our products with comprehensive warranty coverage.
To ensure you receive the exact product for your specific application, please provide the following information when placing your order:
Rated voltage and rated current
Required minimum creepage distance
Preferred insulator material (porcelain or polymer)
Whether an arc-shortening rod should be included
Type of mounting bracket required
A drop out fuse cutout is a protective device used in electrical distribution systems to provide short-circuit and overcurrent protection for overhead lines, transformers and capacitor banks. It can also be used as a manual disconnect switch for routine maintenance operations.
Fuse cutouts are more economical and simpler to maintain than circuit breakers. They use a replaceable fuse element that melts when overcurrent occurs, while circuit breakers can be reset after tripping. Fuse cutouts are typically used for lower current applications in distribution systems where cost-effectiveness and simplicity are priorities.
Yes, our fuse cutouts are specifically designed for outdoor use in various environments. All ferrous parts are hot-dip galvanized with a thick zinc coating for corrosion resistance. For highly corrosive coastal areas, we strongly recommend our polymer insulator option which offers superior salt spray resistance.
All HAIVOL fuse cutouts are manufactured and tested according to IEC 60282-2:2008, IEEE Std C37.41-2008 and IEEE Std C37.42-2009 international standards.
