Product Description
General
The drop-out fuse and pull-load drop-out fuse serve as essential outdoor high-voltage protection devices for electrical systems. Positioned strategically on the high-voltage side of distribution transformers or as a Support Link in distribution lines, they offer robust protection against transformer and line short circuits, overloads, and facilitate current flow management. Constructed with an insulating bracket and fuse tubes, each fuse features static contacts installed at each end of the insulation bracket. The moving contacts are securely placed on either end of the fuse tube, which is comprised of a sophisticated inner arc tube and an outer phenolic paper tube or epoxy glass cloth tube. The pull-load drop-out fuse takes functionality further with flexible auxiliary contacts and an arc chute, enhancing its capability to manage current load efficiently.
In standard operations, the fuse tube maintains a closed position under fuse tension. Upon a system failure, the fault current swiftly blows the fuse, resulting in the formation of an arc. This arc ignites the arc tube, decomposing vast amounts of gas to generate high pressure within the tube, creating a vertical wind along the pipeline. The arc is then rapidly elongated and dissipated. Once the fuse blows, the moving contact loses its tension, triggering the locking mechanism to release the fuse tube and allowing it to drop, forming an open circuit position. During load operations, an insulating rod is used to pull the moving contact, which remains in contact with the static contact. As the pull continues, the auxiliary contacts separate, and an arc forms between them. This arc stretches within the hood slit, where the arc cover, filled with gas, extinguishes the arc as the current reaches zero.
Use and Standards
Specifically crafted for 10 ~ 35KV distribution lines, this product seamlessly integrates into branching lines and the primary side of distribution transformers. It excels in providing overload and short circuit protection while enabling the separation and combination of the rated load current with utmost efficiency.
In adherence to JB/T8321-1996 standards for AC high-voltage fuses, the product model follows meticulous preparation methods. All product parameters align with GB15166.3-1994 standards for high voltage expulsion fuses. Although certain parameters and configurations lack clear definitions, the product is rigorously corrected as per the JB/DQ2139-1986 requirements for 10 ~ 35KV outdoor high voltage drop fuses.
Drop-out fuse cutouts and load switching fuse cutouts are vital outdoor high-voltage protective devices. These devices are integral to the incoming feeder connection of distribution transformers or lines, offering paramount protection against short circuits and overloads while managing load current efficiently. Composed of insulated supports and fuse tubes, the static contacts are firmly affixed on each side of the insulator support, with moving contacts positioned at the ends of the fuse tube. The interior arc-extinguishing tube is enveloped by an outer phenolic compound paper tube or epoxy glass tube. The load switching fuse cutout augments functionality with enforced elastic auxiliary contacts and a sophisticated arc-extinguishing enclosure for superior current management.
During normal operation, the fuse link securely stabilizes the fuse tube in a closed position. Upon a fault in the system, the fault current promptly melts the fuse link, generating an electric arc that heats the arc-extinguishing tube, causing a significant gas release. This results in high pressure that propels the arc along the tube. After the fuse link melts, the moving contact loses its tension, locking the mechanism and causing the fuse tube to drop out, placing the cutout in an open position. When switching off during cutout loading is necessary, operators use an insulating operating bar to pull the moving contact. Initially, the main contact remains connected with the auxiliary static contact. As the pulling continues, the auxiliary contacts separate, creating an arc between them. This arc is elongated within the arc-extinguishing enclosure gap, where the arc-extinguishing gas effectively blows off the arc as the current approaches 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. is a distinguished high-tech enterprise at the forefront of electrical integration. With a seasoned professional team excelling in R&D, production, and service, we leverage over 15 years of rich industry experience to deliver unparalleled quality and innovation.
Our diverse product portfolio features cutting-edge high-voltage solid-state soft starters, robust capacitor cabinets, versatile high and low voltage switchgear, advanced gas-insulated switchgear, and comprehensive substation solutions. Our high-performance offerings are pivotal across sectors including energy and chemical industries, metal smelting, electric power grids, industrial manufacturing, academia, medical and pharmaceutical fields, as well as municipal commerce. They also play crucial roles in water conservancy, hydropower, road traffic management, and diverse commercial and residential applications, ensuring efficiency and reliability.
Embracing a core philosophy of 'smart manufacturing' and unrelenting technological innovation, we actively attract top-tier technical talents to fortify our company's competitive edge. We are resolute in providing exceptional value and service to our clientele, aiming to establish an industry-leading brand. Since our inception, Zhejiang ChaoTai has evolved remarkably, transforming challenges into successes, continuously excelling through dedication to innovation. Guided by modern business principles—survival through uncompromising quality, market adaptability, growth through esteemed reputation, and efficiency via strategic management—we are dedicated to operational excellence. Our commitment to 'technology leadership, standardized management, superior quality, and customer satisfaction' enhances our market prowess, propelling us to meet ambitious objectives within China's electric power and grid transmission sectors. Integrity remains our foundation; quality, our core; service, our promise; and customer satisfaction, our unwavering mission. By pursuing excellence and fostering innovation, we aim to build a reliable brand that earns your trust. We are profoundly grateful for the enduring support and trust of our esteemed customers, and Zhejiang ChaoTai warmly invites you to join us in forging a prosperous future together.
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}