Product Description
General
The drop-out fuse and pull-load drop-out fuse serve as essential outdoor high-voltage protection devices for electrical systems. These fuses are installed on the high-voltage side of distribution transformers or within the support link of distribution lines, providing robust protection against transformer and line short circuits, overloads, and allowing for current interruption. The drop-out fuse comprises an insulating bracket and fuse tubes, with static contacts affixed at both ends of the insulation bracket, while moving contacts are located at both ends of the fuse tube. Constructed from an inner arc tube and an outer phenolic paper or epoxy glass cloth tube, the pull-load drop-out fuse features enhanced flexibility through auxiliary contacts and an arc chute, facilitating seamless current interruption.
During normal operations, the fuse tube maintains a closed position due to the tension of the fuse. In the event of a system fault, the fault current swiftly melts the fuse, generating an arc. This arc ignites the arc tube, decomposing a large amount of gas which creates high pressure within the tube and generates a vertical wind along the pipeline. This process rapidly stretches and elongates the arc. Once the fuse blows, the moving contact loses its tension and triggers the locking mechanism, releasing the fuse tube, which then drops into the breaking position. To interrupt the load, an insulating rod is used to disengage the moving contact. Initially, the moving and static contacts remain in contact. Continued use of the insulating rod separates the auxiliary contacts, generating an arc between them. This arc stretches within the hood slit, where the arc cover contains gas. When the current reaches zero, the arc is extinguished.
Use and Standards
This product is designed for use in 10 to 35KV distribution line branches and on the primary side of distribution transformers. It serves to protect against overloads and short circuits, while enabling the separation and combination of rated load current.
The product model adheres to JB/T8321-1996 standards for preparing type AC high-voltage fuses. Product parameters comply with GB15166.3-1994 high voltage fuse expulsion fuse standards. Although some important parameters and configurations are not explicitly defined in the standards, corrections are made according to JB/DQ2139-1986 requirements for 10 to 35KV outdoor high voltage drop fuses.
The drop-out fuse cutout and load switching fuse cutout are critical outdoor high-voltage protective devices. They connect to the incoming feeder of distribution transformers or distribution lines, providing essential protection against short circuits and overload, while facilitating on/off loading and current management. The drop-out fuse cutout consists of insulating insulator supports and a fuse tube, with static contacts fixed on both sides of the insulator support and moving contacts at both ends of the fuse tube. The fuse tube is constructed from an inner arc-extinguishing tube and an outer phenolic compound paper or epoxy glass tube. The load switching fuse cutout features enforced elastic auxiliary contacts and an arc-extinguishing enclosure for effective on-off loading current management.
Under normal operating conditions, the fuse link tightly secures the fuse tube in a closed position. If a system fault occurs, the fault current immediately melts the fuse, creating an electric arc that heats the arc-extinguishing tube, releasing a large volume of gas. This process generates high pressure and facilitates arc blowing along the tube. Once the fuse link melts, the moving contact loses tension, the mechanism locks, and the fuse tube drops out, putting the cutout in an open position. To switch off during cutout loading, the operator uses an insulating operating bar to disengage the moving contact. Initially, the main and auxiliary static contacts remain engaged. As the operator continues pulling, the auxiliary contacts separate, generating an electric arc that lengthens in the arc-extinguishing enclosure gap. During this process, the arc-extinguishing gas expels to extinguish 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. stands as a beacon of innovation and expertise in the realm of electrical integration, proudly hailed as a high-tech enterprise. Backed by a dynamic team specializing in research and development, production, and exemplary service, we bring more than 15 years of profound industry experience to the table.
Our product lineup is a testament to our commitment to excellence, featuring high-voltage solid-state soft starters, cutting-edge capacitor cabinets, versatile high and low voltage switchgear, sophisticated gas-insulated switchgear, and advanced substations. Our groundbreaking products find their place in a wide array of sectors, including energy and chemical industries, metal smelting, the sprawling electric power grids, various facets of industrial manufacturing, esteemed universities and research institutions, vital medical and pharmaceutical sectors, dynamic municipal commerce, essential water conservancy and hydropower, streamlined road traffic, as well as bustling commercial and residential areas.
Guided by a relentless pursuit of technological innovation and a bold 'smart manufacturing' philosophy, we actively recruit top-tier technical talents to elevate our core competencies. This dedication allows us to deliver unparalleled services to our valued clients while ambitiously aiming to establish the premier brand in our industry. Since inception, our journey has been one of remarkable progression—rising from humble beginnings to achieve exceptional status. Our unwavering dedication to innovation sees us embracing a forward-thinking business strategy that thrives on quality, market responsiveness, reputation-driven growth, and efficiency-driven management. Our commitment to 'technology as the guide, standardized management, excellent quality, and customer satisfaction' ensures our competitive edge in the market. With a steadfast focus on serving China's electric power and grid transmission and distribution sectors with agility, strength, and ambition, we prioritize integrity, champion quality, and honor superior service. Client satisfaction remains our eternal creed. Our relentless pursuit of excellence and innovation drives us to build a reputable and trustworthy brand. Your recognition fuels our passion. We express heartfelt gratitude to our loyal customers for their unwavering support and enthusiasm. Senhang Technology eagerly anticipates collaborating with you to shape a brighter 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.
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