Product Description
General
The drop-out fuse and pull load drop-out fuse are indispensable outdoor high-voltage protection devices for electrical systems. Designed to be installed on the high-voltage side of distribution transformers or as support links in distribution lines, they serve as safeguards against transformer and line short circuits, overloads, and co-load currents. Each drop-out fuse comprises an insulating bracket and fuse tubes, with static contacts mounted at both ends of the insulation bracket. Meanwhile, moving contacts are fitted on both ends of the fuse tube, which consists of an inner arc tube encapsulated in an outer layer made of phenolic paper or epoxy glass cloth. The pull load drop-out fuse is enhanced with flexible auxiliary contacts and an arc chute, enabling efficient handling of open and co-load currents.
During normal operations, the fuse tube is held in a closed position by the tension of the fuse wire. However, in the event of a system failure, the fault current swiftly blows the fuse, generating an arc. The arc tube, scorched by the electric arc, decomposes to release significant amounts of gas, creating high pressure within the tube. This results in a vertical wind along the pipeline, swiftly stretching and elongating the arc. Once the fuse is blown, the tension in the moving contact is lost, causing it to rotate and disengage the locking mechanism, subsequently releasing the fuse tube and establishing a breaking position. To pull the load, an insulating rod is employed to draw the moving contact. Initially, the moving and static contacts remain engaged. Continued pulling with the insulating rod separates the auxiliary contacts, leading to the appearance of an arc between them. This arc extends into the hood slit, and as the arc cover discharges gas, the arc is extinguished when the current reaches zero.
Use and Standards
This product is designed for use in 10 ~ 35KV distribution lines, specifically on branching lines and the primary side of distribution transformers. It provides reliable protection against overloads and short circuits, ensuring effective separation and combination of the rated load current.
The product's model follows the JB/T8321-1996 methodology for type AC high-voltage fuses. Its parameters conform to the GB15166.3-1994 standards for high voltage expulsion fuses. Although some parameters and configurations are not explicitly defined by these standards, they align with the interim technology requirements specified in JB/DQ2139-1986 for outdoor high voltage drop fuses rated at 10 ~ 35KV.
Drop-out fuse cutouts and load switching fuse cutouts are high voltage protective devices designed for outdoor use. They are connected with the incoming feeder of distribution transformers or distribution lines, primarily safeguarding transformers or lines from short circuits and overloads, as well as facilitating on/off loading currents. The drop-out fuse cutout consists of insulator supports and a fuse tube, with static contacts affixed to both sides of the insulator support and moving contacts installed at both ends of the fuse tube. The fuse tube features an inner arc-extinguishing tube, encased in an outer phenolic compound paper or epoxy glass tube. The load switching fuse cutout is equipped with enhanced elastic auxiliary contacts and an arc-extinguishing enclosure, ensuring efficient switching of on-off loading currents.
Under normal conditions, the fuse link secures the fuse tube in a closed position. If a fault occurs within the system, the resultant fault current causes the fuse to melt instantaneously, generating an electric arc. This, in turn, heats the arc-extinguishing tube, releasing a substantial amount of gas, creating high pressure and directing the arc along the tube. Following the melting of the fuse link, the moving contact loses its tension, locking the mechanism and causing the fuse tube to drop out, leaving the cutout open. In situations where switching off during cutout loading is necessary, operators use an insulating operating bar to pull the moving contact. Initially, the main and auxiliary static contacts remain engaged. As the auxiliary contact is pulled further apart, an electric arc forms between the auxiliary contacts, which is lengthened within the arc-extinguishing enclosure's gap. The arc-extinguishing process releases gas 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. is at the vanguard of high-tech innovation, specifically excelling in electrical integration. With a seasoned and highly proficient R&D, production, and service team boasting over a decade and a half of industry prowess, we are dedicated to advancing technology and meeting the highest standards in the field.
Our premier range of products includes advanced high-voltage solid-state soft starters, cutting-edge capacitor cabinets, versatile high and low voltage switchgear, state-of-the-art gas-insulated switchgear, and comprehensive substations. Our solutions are indispensable across an array of sectors such as energy and chemical industries, robust metal smelting, dynamic electric power grids, sophisticated industrial manufacturing, esteemed universities and research institutions, the critical medical and pharmaceutical fields, vibrant municipal commerce, essential water conservancy and hydropower, strategic road traffic management, and iconic commercial and residential developments.
In our relentless pursuit of technological advancement, we embrace the philosophy of 'smart manufacturing,' actively recruiting top-tier technical talents to solidify our core competitive edge. Our commitment is to deliver unparalleled value to our esteemed customers and elevate our position as an industry leader. Since inception, we have charted a remarkable journey from inception to excellence. Innovation is our mantra, and we adhere to a modern business ethos that thrives on quality, market responsiveness, reputed development, and management efficiency. Guided by technology, adhering to standardized management, ensuring superior quality, and prioritizing customer satisfaction are the pillars of our quality and talent management strategy. Our mission is to enhance market competitiveness, serving the power transmission and distribution sectors of China's electric grid with unmatched speed, power, and ambition. Our foundation is built on integrity, with quality as our hallmark, and service as our creed. We are dedicated to pursuing excellence through continuous innovation, crafting a brand that inspires trust and confidence. Your trust fuels our passion, and we extend heartfelt gratitude to our loyal customers, both new and longstanding, for your unwavering support. At Senhang Technology, we stand ready to partner with you on a journey to a brighter, more prosperous future.
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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