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Drop-out fuse serves as a commonly used short-circuit protection device for 10-38kV distribution line branches and distribution transformers. It adapts to various outdoor environments and supports economical operation and maintenance, with wide application in 10-38kV distribution systems and primary-side protection of distribution transformers for equipment switching and disconnection operations. This 33kV loadbreak model adds an arc chute structure to realize load breaking capability, expanding the application flexibility of overhead line protection devices.
This loadbreak fuse cutout applies to 10kV to 38kV overhead distribution systems. Equipped with a dedicated arc chute structure, it delivers both short-circuit protection and load breaking functions, suitable for overhead line protection and distribution transformer primary-side control. The rated current of the device ranges from 100A to 200A, which can match the load requirements of most medium-voltage distribution scenarios. It supports direct pole-mounted installation, adapting to routine switching operations and fault protection demands of commercial power distribution and industrial power supply systems.
Two insulator material options are available for different application demands. For porcelain insulators, the porcelain body connects with hardware fittings through cement pouring, using Por-Rok anchoring cement manufactured by CGM INC from the United States. This cement features fast solidification, high mechanical strength and low expansion coefficient, supporting stable performance in long-term outdoor exposure. For polymer insulators, hardware fittings are crimped onto a fiberglass rod, with the housing and sheds made of high-temperature vulcanized silicone rubber. The insulator is formed by one-piece injection molding, with stable sealing performance and tracking and erosion resistance. All ferrous parts are processed by hot dip galvanizing, with a zinc coating thickness of over 86μm, which supports corrosion resistance in humid and saline outdoor environments.
This fuse cutout adopts a single vent design. When the fuse cutout performs interruption operation, exhaust gas discharges downward and outward. This structure prevents rainwater from intruding into the internal chamber, avoids damage to upper lines caused by free gas, and contributes to improved interruption capacity under fault conditions.
All copper casting parts are made of bronze or brass, with stable mechanical strength and electrical conductivity. All contact surfaces are silver-plated and adopt a convex design, which reduces contact resistance and maintains consistent conductive performance. High-strength memory copper alloy sheets ensure stable contact with the lower contact without interference when the fuse element drops out. An arc-shortening copper rod is configured to enhance interruption capacity during short-circuit faults.
For the loadbreak type fuse cutout, the arc chamber is made of special reinforced nylon material. This material has stable mechanical strength, anti-aging and flame retardant properties, making the device suitable for installation in areas with high ultraviolet radiation, high altitude and coastal regions with high salinity.
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 |
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All fuse cutouts are manufactured and tested in accordance with the latest applicable international standards, including IEC 60282-2:2008, IEEE Std C37.41-2008 and IEEE Std C37.42-2009. The production and testing processes follow the requirements of these standards to ensure consistent product performance and interchangeability with standard distribution system components.
To ensure the delivered product matches project requirements, please provide the following detailed information when placing an order:
Rated voltage and rated current
Minimum creepage distance
Insulator material
Requirement for arc-shortening rod fitting
Type of mounting bracket
Two insulator options are provided: porcelain insulator and polymer insulator. Porcelain insulators adopt cement pouring connection with high mechanical strength, suitable for conventional outdoor distribution scenarios. Polymer insulators use one-piece injection molded silicone rubber housing, with better tracking and erosion resistance for heavily polluted areas. Buyers can select the appropriate type based on local environmental conditions.
Yes. The arc chamber uses reinforced nylon material with anti-aging and flame retardant properties, and all ferrous parts have a hot dip galvanized zinc layer of over 86μm. These designs allow the device to operate stably in high ultraviolet areas, high altitude areas and coastal areas with high salt spray.
This fuse cutout provides short-circuit protection for overhead distribution lines, and supports load breaking operations with the built-in arc chute. It is usually installed on the primary side of distribution transformers to realize equipment protection and routine switching operations, reducing the impact of line faults on downstream power facilities.
To get an accurate product configuration, buyers need to confirm five key parameters: rated voltage and current, required minimum creepage distance, preferred insulator material, whether an arc-shortening rod is needed, and the type of mounting bracket. The support team can provide configuration suggestions based on provided project information.
