Product Description
General
The Drop-out Fuse and Pull Load Drop-out Fuse are designed as indispensable outdoor high-voltage electrical protection devices. Strategically installed on the high-voltage side of distribution transformers or within distribution lines, they act as vital defenders against transformer and line short circuits, as well as overload conditions. These devices enable effective opening and co-loading of current. Ingeniously crafted, the drop-out fuse consists of an insulating bracket paired with fuse tubes, where static contacts are securely positioned at both ends of the bracket and moving contacts are affixed to the ends of the fuse tube. The fuse tube itself boasts a dual-layer construction, featuring an inner arc tube seamlessly integrated with an outer layer made of phenolic paper or epoxy glass cloth tube. The Pull Load Drop-out Fuse comes with added versatility through auxiliary contacts and an arc chute, purposefully designed to ensure smooth current load operations.
During regular operations, the drop-out fuse remains firmly in a closed position with the fuse tube under tension. When a system fault occurs, the fault current immediately blows the fuse, producing an arc. This arc activates the arc tube, which decomposes large volumes of gas, creating high pressure inside the tube and generating a vertical wind path. This sophisticated mechanism efficiently stretches and lengthens the arc. Once the fuse has blown, the moving contact releases tension and moves outward, while the locking mechanism disengages to allow the fuse tube to drop into a breaking position. In scenarios requiring load pulling, an insulating rod is used to pull the moving contact, maintaining a connection with the static contact. With continued effort, the auxiliary contacts separate, forming an arc between them, which stretches within the hood slit. The arc cover, which contains gas, aids in extinguishing the arc as the current reaches zero.
Use and Standards
This exceptional product is meticulously engineered for use in 10 to 35KV distribution lines, including branching lines and on the primary side of distribution transformers. It provides robust protection against overloads and short circuits, while enabling the effective separation and combination of rated load current with precision and reliability.
The comprehensive design of this product adheres to the JB/T8321-1996 Method for AC high-voltage fuse preparation. Furthermore, the product parameters meet the standards of GB15166.3-1994 high voltage fuses Expulsion fuses requirements. In instances where the standards do not provide detailed definitions of critical parameters and configurations, adjustments are executed following the JB/DQ2139-1986 interim technology requirements for 10 to 35KV outdoor high voltage drop fuses, ensuring supreme performance and dependability.
The Drop-out Fuse Cutout and Load Switching Fuse Cutout are top-tier outdoor high-voltage protective devices. Expertly designed to connect with the incoming feeder of distribution transformers or lines, they are fundamental in protecting transformers and lines from short circuit events and overload conditions, while proficiently managing the on/off load current. The drop-out fuse cutout is comprised of insulating insulator supports coupled with a fuse tube, where static contacts are securely fixed on both sides of the insulator support, and moving contacts are installed at the ends of the fuse tube. The fuse tube itself incorporates an internal arc-extinguishing tube along with an outer phenolic compound paper tube or epoxy glass tube. The load switching fuse cutout also features reinforced elastic auxiliary contacts and an arc-extinguishing enclosure to ensure efficient on-off load current switching.
In standard operational conditions, the fuse link ensures that the fuse tube remains tightened to maintain a closed position. When faults arise, the fault current causes the fuse to melt instantaneously, initiating an electric arc. This results in the arc-extinguishing tube heating up and releasing a substantial volume of gas, creating high pressure and elongating the arc throughout the tube. Once the fuse link has melted, the moving contact loses tension, allowing the mechanism to lock and the fuse tube to drop out, switching to an open position. For load switching during cutout operations, operators utilize an insulating operating bar to pull the moving contact. Initially, the main contact stays 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. Concurrently, the arc-extinguishing mechanism releases gas to extinguish the arc as the current transitions 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 electrical integration industry. As a dynamic and forward-thinking high-tech enterprise, we pride ourselves on our experienced R&D, production, and service teams, each enriched with over 15 years of dedicated expertise in the industry. This wealth of experience equips us to lead with confidence and distinction.
Our vast array of products is designed to meet the most demanding standards, featuring high-voltage solid-state soft starters, capacitor cabinets, versatile high and low voltage switchgear, state-of-the-art gas-insulated switchgear, and resilient substations. These high-performance solutions serve an extensive range of sectors, including energy and chemical industries, metal smelting, expansive electric power grids, and industrial manufacturing. Our reach extends to prestigious universities and research institutions, empowering the medical and pharmaceutical sectors, supporting municipal commerce, enhancing water conservancy and hydropower endeavors, refining road traffic systems, and enriching commercial and residential projects.
At the heart of our operations lies an unwavering commitment to technological innovation and the philosophy of "smart manufacturing." We are resolute in our pursuit to attract top-notch technical talent, elevating our company's core competitive advantage. Our dedication to delivering unparalleled value to our clients fuels our ambition to create the most revered brand in the industry. Since our inception, we have journeyed from humble beginnings to industry leadership, steadfastly adhering to a modern business ethos that prioritizes quality as our lifeline, market orientation, reputation-driven growth, and efficiency through management. Our guiding principles are rooted in "technology as the guide, standardized management, exceptional quality, and customer satisfaction," which drive our efforts to enhance market presence. Our mission is to serve China's electric power and grid transmission and distribution sectors with increasing velocity, strength, and visionary ambition. Integrity is our foundation, quality is our vow, service is our promise, and customer satisfaction is our eternal pledge. Our relentless pursuit of excellence, continuous innovation, and commitment to building a brand worthy of trust are the cornerstones of our progress. Your recognition is our greatest reward. We extend our deepest gratitude to our loyal clients for their steadfast support, and Senhang Technology looks forward to partnering with you to craft a future filled with promise and potential.
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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