Product Description
General
The drop-out fuse and pull load drop-out fuse are indispensable outdoor high-voltage electric protection devices. Primarily positioned on the high-voltage side of the distribution transformer or at the distribution line's support link, these fuses excel in safeguarding transformers and lines from short circuits, overloads, and managing co-load currents efficiently. Constructed with a robust insulating bracket and fuse tubes, the static contacts are securely mounted at each end of the insulation bracket, while the moving contacts are affixed to both ends of the fuse tube. The fuse tube itself features a sophisticated design, comprising an inner arc tube and an outer tube made of either phenolic paper or epoxy glass cloth. To maximize flexibility, the pull load drop-out fuse includes enhanced auxiliary contacts and an arc chute to proficiently manage open and co-load currents.
In normal operations, the drop-out fuse maintains a secure closed position by the fuse tube's tension. Upon encountering a system failure, the fault current swiftly blows the fuse, producing an arc. This arc ignites the arc tube, which decomposes to release a substantial volume of gas, creating high pressure within the tube. This pressure generates a vertical wind along the pipeline, elongating and stretching the arc. Once the fuse is blown, the moving contact loses its tension, pivots outwards, and the locking mechanism releases, allowing the fuse tube to drop and create an open position. For load operations, an insulating rod is used to pull the moving contact. Initially, the moving and static contacts remain engaged. Continued pulling separates the auxiliary contacts, producing an arc between them. This arc is stretched within the hood slit, where the arc cover contains gas. Once the current falls to zero, the arc extinguishes.
Use and Standards
This exceptional product is designed for use in 10 ~ 35KV distribution line branches and on the primary side of distribution transformers. It offers unparalleled protection against overloads and short circuits, facilitating seamless separation and combination of the rated load current.
The product model is developed in accordance with JB/T8321-1996, detailing the method of type AC high-voltage fuses. The product parameters adhere to GB15166.3-1994 standards for high-voltage expulsion fuses. These standards, while comprehensive, do not explicitly define critical parameters and configurations. Therefore, they are adjusted and refined according to JB/DQ2139-1986, which lays out interim technical requirements for 10 ~ 35KV outdoor high-voltage drop fuses.
Drop-out fuse cutouts and load switching fuse cutouts are essential outdoor high-voltage protective devices, seamlessly integrating with the incoming feeder of distribution transformers or distribution lines. Their primary role is to shield transformers and lines from short circuits and overloads, as well as to manage on/off loading currents effectively. Each drop-out fuse cutout is engineered with insulating insulator supports and a fuse tube, where static contacts are mounted on either side of the insulator support, and moving contacts are installed at each end of the fuse tube. The fuse tube comprises an inner arc-extinguishing tube, while the outer tube is crafted from either phenolic compound paper or an epoxy glass tube. The load switching fuse cutout is enhanced with fortified elastic auxiliary contacts and an arc-extinguishing enclosure, ensuring smooth on-off load current management.
Under normal working conditions, the fuse link secures the fuse tube in a firm closed position. In the event of system faults, the fault current causes the fuse to melt immediately, creating an electric arc. This arc heats the arc-extinguishing tube, which explosively releases a large volume of gas, generating high pressure and creating a blow effect along the tube. Once the fuse link melts, the moving contact loses its tension, the mechanism locks, and the fuse tube drops out, transitioning the cutout to an open position. For cutout loading switch-off, the operator uses an insulating operating bar to pull the moving contact. Initially, the main contact and auxiliary static contact remain connected. As the auxiliary contact is pulled, an electric arc forms between auxiliary contacts, elongating in the arc-extinguishing enclosure gap. Simultaneously, the arc-extinguishing gas is released to extinguish the arc as the current passes 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 proudly as a beacon of innovation in the realm of electrical integration. As a high-tech enterprise, we boast a prestigious team dedicated to research, development, production, and service excellence, with over 15 years of rich industry experience.
Our impressive array of products includes cutting-edge high-voltage solid-state soft starters, advanced capacitor cabinets, versatile high and low voltage switchgear, state-of-the-art gas-insulated switchgear, and efficient substations. These products cater to a broad spectrum of industries such as energy and chemical sectors, metal smelting, electric power grids, industrial manufacturing, and more. Our solutions are trusted and implemented in universities, research institutions, the medical and pharmaceutical fields, municipal commerce, water conservancy, hydropower, road traffic systems, as well as in urban and residential settings.
Guided by a philosophy of technological innovation and 'smart manufacturing,' we are actively drawing in top-tier technical talent to elevate our core capabilities. Our mission is to deliver unparalleled value to our cherished customers while aspiring to be the industry's leading brand. Since our inception, we've transformed challenges into opportunities, achieving excellence through a steadfast commitment to innovation. Our business ethos embraces quality as the cornerstone of survival, market demands as a directive, reputation as the path to growth, and management as the key to efficiency. We are diligently committed to our principles of 'technology leadership, standardized management, superior quality, and customer satisfaction,' which underpin our quality assurance and technical prowess. Our goal is to bolster our market presence and serve the transmission and distribution sectors of China's electric power and grid with greater speed, strength, and ambition. Integrity forms the bedrock of our operations, where quality reigns supreme, service is unmatched, and customer satisfaction is our perpetual pursuit. As we continue to strive for excellence and foster innovation, our vision remains to create a brand synonymous with trust and reliability. We deeply value the support of our esteemed clientele and look forward to forging a future of shared success with you.
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.
Audited Supplier 
){kind=link}