Product Description
General
The Drop-out Fuse and Pull Load Drop-out Fuse are quintessential solutions for outdoor high-voltage electrical protection. These devices are strategically positioned either on the high-voltage side of distribution transformers or as essential support links in distribution lines. They serve as critical safeguards against transformer and line short circuits, overload conditions, and facilitate the opening and co-loading of current. The drop-out fuse is ingeniously crafted using an insulating bracket and fuse tubes, with static contacts affixed at both ends of the bracket and moving contacts attached to the ends of the fuse tube. The construction of the fuse tube features an inner arc tube coupled with an outer phenolic paper tube or epoxy glass cloth tube. The Pull Load Drop-out Fuse boasts enhanced flexibility with auxiliary contacts and an arc chute, specifically designed for seamless current load operations.
During standard operations, the drop-out fuse is securely held in a closed position with the fuse tube tensioned. Upon system malfunction, the fault current swiftly blows the fuse, generating an arc. This arc ignites the arc tube, causing the decomposition of large gas volumes, creating high pressure inside the tube, and generating a vertical wind path. This remarkable mechanism quickly stretches and elongates the arc. Once the fuse has blown, the moving contact releases tension and rotates outwards, while the locking mechanism disengages, allowing the fuse tube to drop and achieve a breaking position. When it becomes necessary to pull the load, an insulating rod is employed to pull the moving contact, maintaining contact with the static contact. With continued effort, the auxiliary contacts separate, creating an arc between them that is stretched within the hood slit. The arc cover, which contains gas, facilitates the arc extinguishment as the current reaches zero.
Use and Standards
This distinguished product is specially designed for deployment in 10 to 35KV distribution lines, including branching lines and on the primary side of distribution transformers. It offers robust protection against overloads and short circuits while enabling efficient separation and combination of the rated load current.
The meticulous design of this product adheres to the JB/T8321-1996 Method for AC high-voltage fuse preparation, while the product parameters conform to GB15166.3-1994 high voltage fuses Expulsion fuses standards. Where the standards lack detailed definitions of critical parameters and configurations, adjustments are made following the JB/DQ2139-1986 interim technology requirements for 10 to 35KV outdoor high voltage drop fuses.
The Drop-out Fuse Cutout and Load Switching Fuse Cutout are premier outdoor high-voltage protective devices. Designed to connect with the incoming feeder of distribution transformers or lines, they play a crucial role in safeguarding transformers and lines from short circuit incidents and overload conditions while managing the on/off load current. The drop-out fuse cutout comprises insulating insulator supports and a fuse tube, with static contacts fixed on both sides of the insulator support and moving contacts installed at the ends of the fuse tube. The fuse tube features an internal arc-extinguishing tube along with an outer phenolic compound paper tube or epoxy glass tube. The load switching fuse cutout also includes enforced elastic auxiliary contacts and an arc-extinguishing enclosure for efficient on-off load current switching.
In normal operational scenarios, the fuse link ensures the fuse tube is tightened to maintain a closed position. When faults occur, the fault current causes the fuse to melt immediately, generating an electric arc. This causes the arc-extinguishing tube to heat and release a significant volume of gas, creating high pressure and elongating the arc throughout the tube. After the fuse link melts, the moving contact loses its tension, allowing the mechanism to lock and the fuse tube to drop out, switching to an open position. For load switching during cutout, operators must use an insulating operating bar to pull the moving contact. Initially, the main contact remains engaged with the auxiliary static contact. As the auxiliary contact is further pulled, an electric arc forms between the auxiliary contacts, which elongates within the arc-extinguishing enclosure gap. Simultaneously, the arc-extinguishing mechanism expels 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. embodies the pinnacle of innovation and excellence in the realm of electrical integration. As a dynamic high-tech enterprise, we boast a seasoned R&D, production, and service team, enriched by over 15 years of dedicated industry expertise.
Our extensive product lineup includes high-voltage solid-state soft starters, capacitor cabinets, high and low voltage switchgear, cutting-edge gas-insulated switchgear, and robust substations. These high-performance products are integral to a myriad of sectors, encompassing the energy and chemical industries, metal smelting, vast electric power grids, industrial manufacturing, and esteemed universities and research institutions. Additionally, our solutions empower the medical and pharmaceutical sectors, bolster municipal commerce, enhance water conservancy and hydropower projects, optimize road traffic systems, and enrich commercial and residential developments.
Rooted in a steadfast commitment to technological innovation and the philosophy of "smart manufacturing," we are dedicated to attracting top-tier technical talent to holistically elevate our company's core competitive edge. We are fervently devoted to delivering unparalleled value to our clients and aspire to forge the most esteemed brand within the industry. Since our inception, we have made relentless strides, journeying from inception to excellence. Our path is paved with a commitment to innovation and sustained by a modern business ethos, emphasizing quality as our lifeline, market orientation, reputation-driven development, and management-driven efficiency. We steadfastly uphold our commitment to "technology as the guide, standardized management, exceptional quality, and customer satisfaction" as our guiding tenets in quality and technical talent management, diligently working to bolster our market presence. Our mission is to serve China's electric power and grid transmission and distribution fields with increasing speed, strength, and ambition. At our core, integrity is non-negotiable, quality is sacrosanct, service reigns supreme, and customer satisfaction is our eternal creed. Our unwavering pursuit of excellence, relentless innovation, and dedication to building a trustworthy brand remain our guiding principles. Your recognition fuels our progress. We extend our heartfelt gratitude to all our loyal clients for their enduring support, and Senhang Technology eagerly anticipates collaborating with you to forge 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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