Product Description
General
The drop-out fuse and pull load drop-out fuse represent an outdoor high-voltage protective device essential for safeguarding electrical systems. Typically installed on the high-voltage side of distribution transformers or as a supportive link in distribution lines, these fuses ensure protection against transformer and line short circuits, overloads, and facilitate open-circuit load currents. Constructed with an insulating bracket and fuse tubes, the static contact is affixed to both ends of the insulation bracket, while the moving contact is mounted on the fuse tube ends. The fuse tube itself is crafted from an inner arc tube enveloped by an outer phenolic paper tube or an epoxy glass cloth tube. The pull load drop-out fuse is equipped with flexible auxiliary contacts and an arc chute for enhancing operational flexibility when opening or co-load currents are involved.
During normal operation, the drop-out fuse remains in a closed position, with the fuse tube and fuse under tension. Upon system failure, the fault current rapidly melts the fuse, generating an arc. The arc tube, subjected to the intense heat of the arc, releases vast quantities of gas, creating high pressure within the tube. This results in a vertical wind along the pipeline, effectively stretching and elongating the arc. When the fuse blows, the moving contact loses tension, triggers the locking mechanism, releases the fuse tube, and drops it into the breaking position. To pull the load, an insulating rod is employed to disengage the moving contact, maintaining contact with the static contact initially. Continued pulling with the insulating rod separates the auxiliary contacts, with an arc forming and elongating within the hood slit. Gas within the arc cover facilitates the extinguishing of the arc when the current reaches zero.
Use and Standards
This product is ingeniously designed for application in 10 ~ 35KV distribution lines, branching lines, and the primary side of distribution transformers. It provides exemplary protection against overloads and short circuits, while adeptly handling the separation and combination of rated load currents.
The product model adheres to the JB/T8321-1996 Method for type AC high-voltage fuses preparation. It is engineered in compliance with the GB15166.3-1994 high voltage fuses expulsion fuses standards. Where standards ambiguously define key parameters and configurations, corrections are made in accordance with JB/DQ2139-1986 requirements for 10 ~ 35KV outdoor high voltage drop fuses interim technology.
Drop-out fuse cutouts and load switching fuse cutouts are pivotal outdoor high voltage protective devices. They are seamlessly integrated with the incoming feeder of distribution transformers or distribution lines, providing indispensable protection against short circuits and overloads, while managing on/off loading currents. The drop-out fuse cutout comprises insulate insulator supports and a fuse tube, with static contacts secured on both sides of the insulator support and moving contacts installed at the fuse tube ends. The fuse tube's architecture includes an inner arc-extinguishing tube enveloped by an outer phenolic compound paper tube or epoxy glass tube. The load switching fuse cutout features enforced elastic auxiliary contacts and an arc-extinguishing enclosure to adeptly manage on-off loading current.
Under normal working conditions, the fuse link ensures the fuse tube is secured in a closed position. When system faults occur, the fault current rapidly melts the fuse, producing an electric arc that heats the arc-extinguishing tube and releases substantial gas, creating high pressure that blows the arc along the tube. Upon melting of the fuse link, the moving contact loses its tension, the mechanism locks, and the fuse tube drops out, transitioning the cutout to an open position. To switch 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, but further pulling disengages the auxiliary contacts, generating an electric arc that elongates within the arc-extinguishing enclosure gap. Concurrently, the arc-extinguishing mechanism releases gas to extinguish the arc as the current passes 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 at the forefront of electrical integration as a prestigious high-tech enterprise. Boasting a distinguished team in R&D, production, and service, we leverage over 15 years of rich experience to innovate and excel in the industry.
Our product range is nothing short of exceptional, encompassing high-voltage solid-state soft starters, capacitor cabinets, high and low voltage switchgear, advanced gas-insulated switchgear, and state-of-the-art substations. Our solutions have found significant applications across diverse sectors, including the dynamic energy and chemical industries, robust metal smelting, expansive electric power grids, and cutting-edge industrial manufacturing. Our reach extends into esteemed universities, pioneering research institutions, the thriving medical and pharmaceutical sectors, as well as municipal commerce. Furthermore, our expertise serves the crucial water conservancy and hydropower sectors, road traffic systems, and a broad spectrum of commercial and residential areas.
Guided by a relentless pursuit of technological innovation and a visionary 'smart manufacturing' philosophy, we are dedicated to attracting high-caliber technical talent. This commitment enhances our core competitiveness, enabling us to offer unparalleled value to our clients while aiming to establish our brand as a leader in the industry. Since our inception, we have charted a remarkable journey of growth, transitioning from humble beginnings to industry excellence. Our ethos centers on innovation, adhering to a contemporary business model that thrives on quality for survival, market focus for growth, reputation for development, and efficiency through meticulous management. Our unwavering pledge is to prioritize technology as our compass, adhere to standardized management, deliver exceptional quality, and ensure customer satisfaction. This strengthens our market presence and propels us to serve China's electric power and grid sectors with ambitious targets. Integrity is our foundation, quality is our forte, service is our hallmark, and customer satisfaction is our perpetual ethos. Our steadfast goals are the pursuit of excellence, continuous innovation, and crafting a brand that commands trust. Your recognition fuels our journey, and we extend our heartfelt gratitude to all our esteemed customers for their unwavering support and loyalty. Together with Senhang Technology, we anticipate forging a brighter future, 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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