Product Description
General
The drop-out fuse and pull-load drop-out fuse are quintessential outdoor high-voltage electrical protection devices. These are strategically positioned on the high-voltage side of distribution transformers or as a critical link in distribution lines, providing essential protection against transformer and line short circuits, overloads, and facilitating current interruption under load conditions. Constructed from sturdy insulating brackets and fuse tubes, the static contacts are affixed at either end of the insulation bracket, while the moving contacts are skillfully installed at the ends of the fuse tube. The fuse tube itself is a composite of an inner arc-extinguishing tube and an outer tube, crafted from either phenolic paper or epoxy glass cloth. The pull-load drop-out fuse is ingeniously designed with enhanced flexibility through auxiliary contacts and an arc chute, effectively managing the interruption of load current with precision.
During typical operations, the fuse tube is held in a sealed position by the tension of the fuse link. In the event of a system fault, the fault current swiftly melts the fuse, creating an arc. This arc causes the arc-extinguishing tube to burn, releasing a substantial volume of gas, generating high pressure within the tube. This produces a vertical wind along the pipeline, which quickly stretches and elongates the arc. Once the fuse blows, the moving contact loses its tension, releasing the fuse tube into a dropping position. When it becomes necessary to pull the load, an insulating rod is used to separate the moving contact. Initially, the moving and static contacts remain engaged. A continued pull with the insulating rod separates the auxiliary contacts, causing an arc to form between them, which is stretched in the slit of the hood. The arc cover contains gas that helps extinguish the arc when the current reaches zero.
Use and Standards
This state-of-the-art product is indispensable for 10 ~ 35KV distribution lines, branching lines, and the primary side of distribution transformers. It provides robust protection against overloads and short circuits while adeptly handling the separation and combination of rated load currents.
The product model adheres to the JB/T8321-1996 standards for the preparation of type AC high-voltage fuses. It is manufactured in compliance with the rigorous GB15166.3-1994 high voltage fuses expulsion fuses standards. While some critical parameters and configurations are not explicitly defined within the standards, adjustments are made according to JB/DQ2139-1986 interim technical requirements for 10 ~ 35KV outdoor high voltage drop fuses.
Drop-out fuse cutout and load-switching fuse cutout serve as essential outdoor high-voltage protective devices. They are intricately connected to the incoming feeder of the distribution transformer or to distribution lines, primarily safeguarding transformers or lines from short circuits and overloads. They also facilitate the on/off loading of current. The drop-out fuse cutout comprises insulator supports and a fuse tube, with static contacts fixed on either side of the insulator support and moving contacts installed at the ends of the fuse tube. The fuse tube features an inner arc-extinguishing tube, and an outer tube made from phenolic compound paper or epoxy glass, while the load-switching fuse cutout includes enforced elastic auxiliary contacts and an arc-extinguishing enclosure to manage on-off loading current efficiently.
Under normal working conditions, the fuse link secures the fuse tube in a closed position. If a system fault occurs, the fault current melts the fuse link instantly, producing an arc that heats the arc-extinguishing tube, causing it to release a significant amount of gas. This results in high pressure and a downward force on the arc within the tube. Once the fuse link melts, the moving contact loses its tension, the mechanism locks, and the fuse tube drops, leaving the cutout in an open position. During cutout loading, the operator uses an insulating operating bar to pull the moving contact. Initially, the main contact and auxiliary static contact remain engaged. As the auxiliary contact is pulled apart, an electric arc forms between them, which lengthens within the arc-extinguishing enclosure's gap. Simultaneously, the arc-extinguishing process releases gas that extinguishes the arc when the current reaches zero.
Product Parameters
| Typ |
Rated Volatge (kv) |
Rated Current (A) |
Breaking current (kA) |
Impulse voltage (BIL) |
Power-frequency withstand voltage |
Leakage distance (mm) |
Weight (kg) |
| UD-1 |
12 |
100 |
6.3 |
110 |
40 |
250 |
5.8 |
| UD-1 |
12 |
200 |
8 |
110 |
40 |
250 |
5.8 |
| UD-2 |
15 |
100 |
10 |
125 |
45 |
320 |
6.9 |
| UD-2 |
15 |
200 |
12 |
125 |
45 |
320 |
6.9 |
| UD-3 |
24 |
100 |
8 |
150 |
65 |
530 |
10 |
| UD-3 |
24 |
200 |
10 |
150 |
65 |
530 |
10 |
| UD-4 |
15 |
100 |
10 |
125 |
45 |
350 |
4.15 |
| UD-4 |
15 |
200 |
12 |
125 |
45 |
350 |
4.15 |
| UD-5 |
12 |
100 |
6.3 |
110 |
40 |
250 |
6.3 |
| UD-5 |
12 |
200 |
8 |
110 |
40 |
250 |
6.3 |
| UD-6 |
15 |
100 |
10 |
125 |
45 |
320 |
10 |
| UD-6 |
15 |
200 |
12 |
125 |
45 |
320 |
10 |
| UD-7 |
24 |
100 |
8 |
150 |
65 |
540 |
10 |
| UD-7 |
24 |
200 |
10 |
150 |
65 |
540 |
10 |
| UD-7(F) |
33 |
200 |
12 |
170 |
70 |
720 |
4.4 |
| UD-8 |
33 |
100 |
10 |
170 |
70 |
720 |
11.6 |
| UD-8 |
33 |
200 |
12 |
170 |
70 |
720 |
11.6 |
Main product
Company Profile
Zhejiang ChaoTai Complete Equipment Co., Ltd. stands at the forefront of electrical integration as a pioneering high-tech enterprise. With a robust team dedicated to research, development, production, and service, we boast over 15 years of unparalleled industry expertise that fuels our innovative spirit.
Our diverse product portfolio encompasses high-voltage solid-state soft starters, capacitor cabinets, and both high and low voltage switchgear, along with sophisticated gas-insulated switchgear and substations. These state-of-the-art products find applications across a myriad of sectors, such as energy, chemical industries, metal smelting, and electric power grids. Additionally, our innovations cater to industrial manufacturing, esteemed universities, and research institutions, as well as the medical and pharmaceutical domains. Our reach extends into municipal commerce, water conservancy, hydropower, road traffic, and both commercial and residential spaces, showcasing the versatility and reliability of our technological solutions.
Firmly rooted in the philosophy of 'smart manufacturing,' we are unwavering in our commitment to technological innovation. By actively recruiting top-tier technical talents, we significantly bolster our core competitiveness, ensuring that we deliver exceptional value and services to our clientele. Our journey has been marked by remarkable growth—from inception to excellence—underpinned by our dedication to innovation, quality, reputation, and efficient management. We uphold a philosophy that prizes technology leadership, standardized management, and exemplary quality as the keys to customer satisfaction. This approach enhances our market standing, empowering us to meet the ambitious objectives of China's electric power and grid transmission and distribution sectors. Integrity, superior quality, and exemplary service form the bedrock of our ethos, with customer satisfaction as our ultimate aim. In our relentless pursuit of excellence, we remain committed to innovation and building a brand synonymous with trust. Your support and recognition fuel our progress, and we extend our heartfelt gratitude to all our valued customers. Zhejiang ChaoTai Complete Equipment Co., Ltd. eagerly anticipates forging a bright future together with you, hand in hand.
Our Advantages
Certifications
After Sales Service
FAQ
Q1. Are you a factory or trading company?
A.We are a factory.
Q2. Where is your factory located? How can I visit there?
A. Our factory is located in Wenzhou City, Zhejiang Province, China. You can fly to Longwan airport directly. All our clients,from home or abroad, are warmly welcome to visit us!
Q3. What's the payment term?
A. We accept TT. 30% deposit and 70% before shipment, Western Union, L/C At Sight is ok! We'll l show you the photos of the products and packages before you pay the balance.
Q4. Tell me the standard of package? What is your terms of packing?
A: Generally, we pack our goods in neutral white boxes and brown cartons, If vou have leaallyl registered patent, we can pack the goods in your branded boxes after getting your authorization letters.
Q5. Would you accept to use our logo?
A. If you have good quantity,it absolute no problem to do OEM.
Q6. How about the transport?
A. If the number of aoods is small we usually use TNT.DHL.FEDEX.EMS and some express voull offered. If the number of the goods is big usually we use the FWD you offered or we provided. Either by sea or by air is OK.
Q7. What is your Production lead time /delivery time?
A: Generally, it will take 25 to 30 days after receivina vour advance payment.
The specificl delivery time depends on the items and the quantity of your order. Silicone rubber's reqular product is 1,000/ week, Porcelain's need 2-3 weeks about 1000 pcs.
Q8. How do you make our business long-term and good relationship?
A:l. We keep aood auality and competitive price to ensure our customers benefit:
A: 2. We respect every customer as our friend and we sincerely do business and make friendsl with them, no matter where they come from.
A: 3.Most goods we have the type report according the IEC STANDARD
Q9. What is your sample policy?
A: We can supply the sample if we have ready parts in stock, but the customers have to pay the courier cost.
Q10. Can you produce according to the samples?
A: Yes, we can produce by your samples or technical drawings. We can build the molds and fixtures.
Q11. What is your terms of delivery?
A: EXW, FOB, CFR, CIF.
Q12.What certificates do you have?
A:ISO9001,OHSAS18001,ISO14001 certificate and Type test report of product.
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