Product Description
General
The drop-out fuse and pull-load drop-out fuse are essential outdoor high-voltage protective devices. Designed to be installed on the high-voltage side of distribution transformers or at the support link of distribution lines, they provide critical short circuit and overload protection for transformers and lines. This device is composed of an insulating bracket and a fuse tube. Static contacts are firmly positioned at the ends of the insulation bracket, while the moving contacts are secured at the ends of the fuse tube. The fuse tube itself is ingeniously crafted, featuring an inner arc tube and an outer layer made of either high-quality phenolic paper or durable epoxy glass cloth. Additionally, the pull-load drop-out fuse is enhanced with flexible auxiliary contacts and an arc chute to efficiently handle co-load currents.
Under normal conditions, the drop-out fuse maintains a closed position through the tension of the fuse tube. In the event of a system fault, the fault current quickly melts the fuse, generating an arc. The arc ignites the inner arc tube, releasing large volumes of gas and creating high pressure. This results in a vertical wind effect within the tube that rapidly stretches and extinguishes the arc. Once the fuse is blown, the moving contact loses tension, triggering the release of the fuse tube, which then drops to create a breaking position. For load switching, an insulating rod is employed to pull the moving contact. Initially, the moving and static contacts remain engaged. As the rod continues to pull, the auxiliary contacts separate, creating an arc between them, which is stretched within the arc chute. The arc is eventually extinguished when the current reaches zero.
Use and Standards
This product is expertly designed for deployment in 10 ~ 35KV distribution lines, as well as on the primary side of distribution transformers. It offers reliable protection against overloads and short circuits, while also facilitating the seamless separation and combination of rated load currents.
The product follows the robust JB/T8321-1996 method for AC high-voltage fuses. Its parameters are aligned with the GB15166.3-1994 expulsion fuse standards for high voltage fuses. While these standards don't specify some crucial parameters and configurations, adjustments are made according to JB/DQ2139-1986 interim technical requirements for 10 ~ 35KV outdoor high-voltage drop fuses.
Drop-out fuse cutouts and load-switching fuse cutouts represent state-of-the-art outdoor high voltage protection solutions. They connect to the incoming feeder of distribution transformers or lines, providing vital defense against short circuits and overloads, as well as facilitating on/off load current switching. These devices consist of insulator supports and a fuse tube, with static contacts mounted on the support's sides and moving contacts at the ends of the fuse tube. The fuse tube features an inside arc-extinguishing tube and an outer layer constructed from phenolic compound paper or epoxy glass. Load-switching fuse cutouts are equipped with robust elastic auxiliary contacts and an arc-extinguishing enclosure for effective on/off loading current management.
When functioning normally, the fuse link secures the fuse tube in a closed position. In case of system faults, the fault current melts the fuse instantly, creating an electrical arc. This heats the arc-extinguishing tube, causing it to release a significant amount of gas, thereby generating high pressure that expels the arc along the tube. Once the fuse link melts, the moving contact loses its tension, triggering the locking mechanism to release the fuse tube, which then drops, signaling the open position. For load switching, an operator uses an insulating operating bar to pull the moving contact. Initially, the main contact and auxiliary static contact remain in contact. As the auxiliary contact separates, an electric arc forms between the auxiliary contacts, stretching within the arc-extinguishing enclosure gap. Simultaneously, the arc-extinguishing gas is released to extinguish the arc during the current's zero crossing.
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 in the realm of electrical integration. As a high-tech enterprise, we proudly boast a professional team dedicated to research, development, production, and service, all backed by over 15 years of stellar industry experience.
Our diverse array of products includes cutting-edge high-voltage solid-state soft starters, efficient capacitor cabinets, versatile high and low voltage switchgear, robust gas-insulated switchgear, and advanced substations. These superior products find their applications across a myriad of sectors such as energy and chemical industries, metal smelting, electric power grids, industrial manufacturing, top-tier universities and research institutions, as well as the critical medical and pharmaceutical sectors. Moreover, our solutions are integral to municipal commerce, water conservancy and hydropower, road traffic systems, and both commercial and residential areas, ensuring our reach is as broad as it is profound.
At the heart of our company's ethos lies a relentless commitment to technological innovation and the philosophy of 'smart manufacturing.' We actively recruit high-caliber technical talent to significantly bolster our core competencies, all while delivering unparalleled value to our clientele. Our journey from inception to excellence is marked by continuous progress and innovation. We steadfastly adhere to a business strategy that prioritizes quality as the cornerstone of survival, market orientation as the key to expansion, and reputation as the foundation of development, with management-driven efficiency ensuring our success. Our commitment to leading through technology, maintaining standardized management, delivering superior quality, and achieving utmost customer satisfaction fortifies our market competitiveness. We are driven to excel in serving China's electric power and grid distribution sectors with ambitious goals of speed, strength, and elevation. Integrity forms our bedrock, with quality as our utmost priority, service as our ultimate offering, and unwavering customer satisfaction as our perpetual mission. Our pursuit of excellence and continuous innovation drives us in our quest to build a reliable and esteemed brand. Your trust and recognition fuel our journey forward. We extend our heartfelt gratitude to all our esteemed customers, both new and longstanding, for their enduring support and loyalty. Senhang Technology eagerly anticipates the opportunity to forge a prosperous 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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