Product Description
General
The Drop-out Fuse and Pull Load Drop-out Fuse represent an essential component in outdoor high-voltage electrical protection systems. Installed on the high-voltage side of distribution transformers or as a supportive link in distribution lines, they act as a safeguard against transformer and line short circuits, as well as overload protection. Additionally, they facilitate the interruption and co-load current operations. Constructed with an insulating bracket and fuse tubes, the static contacts are affixed to both ends of the insulation bracket, while moving contacts are strategically placed at both ends of the fuse tube. This assembly includes an inner arc tube and an outer tube made of phenolic paper or epoxy glass cloth. The pull load drop-out fuse enhances operational versatility by featuring auxiliary contacts and an arc chute, which aid in effectively managing open and co-load current scenarios.
In standard operations, the fuse tube, under tension from the fuse itself, maintains a closed position. Upon system failure, the fault current swiftly causes the fuse to blow and generate an arc. The arc tube, ignited by this arc, releases a large volume of decomposed gas, creating high pressure within the tube and propelling a vertical wind along the pipeline. This process rapidly elongates the arc. Once the fuse blows, the moving contact releases tension, pivoting outward and triggering the locking mechanism to release the fuse tube, resulting in a break position. For load operations, an insulating rod is used to pull the moving contact. Initially, the moving and static contacts remain engaged. As pulling continues, the auxiliary contacts disengage, allowing an arc to form between them. This arc stretches within the hood slit and is extinguished by gas in the arc cover as the current reaches zero.
Use and Standards
This cutting-edge product is intended for use in 10 ~ 35KV distribution line branches and on the primary side of distribution transformers. It provides robust overload and short circuit protection while managing the separation and combination of rated load currents with precision.
The product model adheres to JB/T8321-1996 standards for AC high-voltage fuses, ensuring top-notch reliability. Parameters are crafted in compliance with GB15166.3-1994 high-voltage fuses standards for expulsion fuses. Although some essential parameters and configurations are not explicitly defined within these standards, adjustments are made according to JB/DQ2139-198610 ~ 35KV outdoor high voltage drop fuse interim technology requirements.
Drop-out Fuse Cutouts and Load Switching Fuse Cutouts serve as vigilant protectors against electrical mishaps in high-voltage outdoor settings. Connecting seamlessly with incoming feeders of distribution transformers or lines, they primarily shield transformers and lines from short circuits and overloads while proficiently managing the on/off operations of loading current. Composed of insulated insulator supports and a durable fuse tube, static contacts are secured on both sides of the insulator support, with moving contacts attached to each fuse tube end. The intrinsic design includes an arc-extinguishing tube inside and an outer tube crafted from phenolic compound paper or epoxy glass. These cutouts also feature enhanced elastic auxiliary contacts and an arc-extinguishing enclosure, ensuring seamless on-off loading current management.
During regular operations, the fuse link keeps the fuse tube securely in a closed position. When faults occur, the resulting fault current promptly melts the fuse, creating an electric arc. This activates the arc-extinguishing tube, which releases a significant amount of gas, generating high pressure that blows the arc along the tube. Once the fuse link melts, the moving contact loses its tension, the mechanism locks, and the fuse tube drops, leaving the cutout in an open position. To facilitate load switching, operators use an insulating operating bar to pull the moving contact. Initially, the main and auxiliary static contacts remain engaged, but as the auxiliary contact is pulled apart, an electric arc forms and elongates within the arc-extinguishing enclosure gap. Simultaneously, the arc-extinguishing gas released extinguishes the arc when the current hits 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 expertise in the realm of electrical integration. As a high-tech enterprise, we boast a seasoned team of R&D professionals, production experts, and service specialists, all with over 15 years of experience in the industry, ensuring cutting-edge solutions and unparalleled service.
Our diverse portfolio of pioneering products includes high-voltage solid-state soft starters, state-of-the-art capacitor cabinets, a range of high and low voltage switchgear, advanced gas-insulated switchgear, and efficient substations. Our offerings have gained prominence and are extensively applied across various sectors: from energy and chemical industries to metal smelting, electric power grids, and industrial manufacturing. Moreover, our solutions are trusted by universities and research institutions, medical and pharmaceutical sectors, as well as municipal commerce. We also serve the needs of water conservancy and hydropower, road traffic, and both commercial and residential areas, meeting the demands of a dynamic and diverse market.
At the core of our philosophy is a commitment to relentless technological innovation and an ethos of 'smart manufacturing.' We actively recruit top-tier technical talent to fortify our company's core strengths, delivering unmatched value to our customers while aspiring to emerge as the preeminent brand in the industry. Since our inception, we have seen remarkable growth—transforming from inception to excellence. Our pursuit of innovation is unwavering as we chart a modern business trajectory that prioritizes survival through superior quality, market responsiveness, reputation-driven growth, and management-driven efficiency. Our commitment to 'technology as the guide, standardized management, excellent quality, and customer satisfaction' defines our quality and talent management strategies, strengthening our market presence and striving to advance China's electric power and grid sectors with greater speed, strength, and ambition. Integrity is our foundation, quality is our priority, service is our hallmark, and customer satisfaction is our perpetual aim. Our relentless pursuit of excellence and continuous innovation fuels our mission to forge a reliable brand. Your trust and support are the catalysts for our progress. We extend our heartfelt gratitude to our valued customers, both longstanding and new, for their unwavering support and loyalty. Senhang Technology is eager to embark on a collaborative journey with you, together forging 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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