Product Description
General
The Drop-out fuse and pull load drop-out fuse serve as essential outdoor high-voltage protective devices. Installed on the high-voltage side of the distribution transformer or as a Support Link in distribution lines, they are crucial for safeguarding against short circuits, overloads, and for managing open and co-load currents. Each Drop-out fuse comprises an insulating bracket paired with fuse tubes. Static contacts are securely affixed to both ends of the insulation bracket, whereas moving contacts are positioned at both ends of the fuse tube. The fuse tube itself is ingeniously crafted from an inner arc tube and an outer phenolic paper tube or epoxy glass cloth tube. For enhanced operational flexibility during load conditions, the pull load drop-out fuse is augmented with auxiliary contacts and an arc chute to manage open and co-load currents effectively.
During regular operations, the drop-out fuse maintains a closed position, held in place by fuse tension within the tube. Upon encountering a system fault, the fault current rapidly burns out the fuse, generating an arc. This arc prompts the arc tube to decompose, releasing copious amounts of gas and creating a high-pressure scenario within the tube, which facilitates arc elongation and stretching. Once the fuse is blown, the moving contact loses its tension, triggering the locking mechanism to release the fuse tube, which then drops to signify a breaking position. When it is necessary to pull the load, an insulating rod is used to disengage the moving contact. Initially, the moving and static contacts remain engaged. Continued action with the insulating rod separates the auxiliary contacts, creating an arc between them. This arc stretches within the hood slit and is extinguished when the current reaches zero, aided by the arc cover filled with gas.
Use and Standards
This high-performance product is specially designed for use in 10 ~ 35KV distribution lines, branching lines, and on the primary side of distribution transformers. Its primary function is to provide robust overload and short circuit protection, alongside the seamless separation and combination of the rated load current.
The product model is crafted following the JB/T8321-1996 Method for type AC high-voltage fuses. Its parameters adhere to the GB15166.3-1994 standards for high voltage expulsion fuses. Given the standards do not explicitly define crucial parameters and configurations, adjustments are made as per JB/DQ2139-1986, which stipulates interim technological requirements for 10 ~ 35KV outdoor high voltage drop fuses.
The drop-out fuse cutout and load switching fuse cutout are meticulously engineered for outdoor use as high-voltage protective devices. They seamlessly connect with the incoming feeder of distribution transformers or lines, playing a pivotal role in shielding transformers and lines from short circuits and overloads, while efficiently managing on/off loading currents. The drop-out fuse cutout is constructed from insulating insulator supports and a fuse tube. Static contacts are strategically fixed on both sides of the insulator support, with moving contacts installed on either end of the fuse tube. Inside the fuse tube, an arc-extinguishing tube is enveloped by an outer phenolic compound paper tube or epoxy glass tube. The load switching fuse cutout is enhanced with enforced elastic auxiliary contacts and an arc-extinguishing enclosure to proficiently switch on/off loading currents.
Under normal working conditions, the fuse link is effectively tightened within the fuse tube to maintain a closed position. Should the system encounter faults, the resultant fault current promptly melts the fuse and generates an electric arc. This event heats and activates the arc-extinguishing tube, leading to the expulsion of a large volume of gas, which generates high pressure, propelling the arc along the tube. Post fuse link melt, the moving contact loses its tension, causing the mechanism to lock and the fuse tube to drop, indicating an open position. For switching off during cutout loading, operators utilize an insulating operating bar to pull the moving contact. Initially, the main contact and auxiliary static contact remain engaged. As the pull continues, the auxiliary contacts separate, creating an electric arc between them. This arc elongates within the arc-extinguishing enclosure gap, and the arc-extinguishing process releases gas to extinguish the arc as the current passes through 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 excellence in the realm of electrical integration. As a pioneering high-tech enterprise, we boast a professional team dedicated to research, development, production, and service. With over 15 years of rich industry experience, our expertise and commitment set us apart as leaders in the field.
Our distinguished line-up of products prominently features high-voltage solid-state soft starters, cutting-edge capacitor cabinets, versatile high and low voltage switchgear, advanced gas-insulated switchgear, and robust substations. Our products power a wide array of industries, spanning energy and chemical sectors, metal smelting, power grids, and industrial manufacturing. Furthermore, they play pivotal roles in academic institutions, the medical and pharmaceutical fields, municipal commerce, water conservancy, hydropower, road traffic systems, as well as in commercial and residential areas.
At Zhejiang ChaoTai Complete Equipment Co., Ltd., we passionately embrace technological innovation and uphold the philosophy of "smart manufacturing." Our strategy involves attracting elite technical talents to bolster our core competencies. We are resolute in our mission to provide unparalleled value to our customers and aspire to set the benchmark in our industry. From inception, our journey has been one of relentless progress—from inception to excellence. We are committed to pursuing innovation, quality-driven survival, market-oriented development, and efficiency through astute management. With a steadfast focus on "technology as the guide, standardized management, leading quality, and customer satisfaction," we elevate our competitive edge in the market. Our dedication is to serve China's electric power transmission and grid sectors with agility, strength, and ambition. Integrity, supreme quality, exceptional service, and unwavering customer satisfaction form the core of our ethos. Our pledge is to pursue excellence, foster continuous innovation, and forge a brand that embodies trust. Your recognition fuels our passion, and we express heartfelt gratitude to all our devoted customers for their steadfast support. Together with Senhang Technology, we eagerly anticipate collaborating to forge a brighter 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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