Product Description
General
The drop-out fuse and the load drop-out fuse are essential components for outdoor high-voltage electrical protection. These devices are strategically installed on the high-voltage side of distribution transformers or the support link of distribution lines, serving as a shield against short circuits and overloads. The drop-out fuse comprises an insulating bracket and fuse tubes, with static contacts mounted on both ends of the bracket, while moving contacts are positioned at each end of the fuse tube. The fuse tube itself is ingeniously crafted from an inner arc tube encompassed by an outer phenolic paper tube or an epoxy glass cloth tube. The pull load drop-out fuse is designed to augment flexibility through auxiliary contacts and an arc chute, allowing effective current management.
During standard operation, the fuse tube, held in tension, maintains a closed position. However, in the event of a system failure, the fault current rapidly triggers the fuse to blow, generating an arc. The arc tube is subjected to the electric arc's intense heat, generating substantial amounts of gas and creating high pressure within the tube. This pressure generates a vertical wind that elongates and stretches the arc. As the fuse blows, the moving contact loses its tension, unlocking the mechanism and releasing the fuse tube, which then drops to indicate a breaking position. When disengaging the load, the operator utilizes an insulating rod to pull the moving contact. Initially, the moving and static contacts remain in contact. Continued pulling results in the separation of auxiliary contacts, producing an arc between them. This arc elongates within the hood slit, where gas is present, extinguishing the arc when the current reaches zero.
Use and Standards
Employed within 10 to 35 kV distribution lines' branching lines and on the primary side of distribution transformers, this product serves as a vital defensive mechanism against overloads and short circuits. It seamlessly facilitates the separation and combination of the rated load current, ensuring optimal performance and reliability.
This product adheres strictly to the model guidelines set by the JB/T8321-1996 Method for AC high-voltage fuses. Its parameters are meticulously designed according to the GB15166.3-1994 high voltage expulsion fuses standards. In scenarios where standards lack clarity on critical parameters and configurations, adjustments are made in line with the JB/DQ2139-1986 interim technical requirements for 10 to 35 kV outdoor high voltage drop fuses.
The drop-out fuse cutout and load switching fuse cutout function as essential outdoor high voltage protective devices. They are crucially connected to the incoming feeder of distribution transformers or distribution lines, offering protection against short circuits and overloads while enabling the management of on/off loading currents. The drop-out fuse cutout consists of insulated insulator supports and a fuse tube, with static contacts securely affixed to both sides of the support. Moving contacts are installed at both ends of the fuse tube, which itself is constructed from an inside arc-extinguishing tube, encased by an outer phenolic compound paper tube or epoxy glass tube. The load switching fuse cutout is equipped with robust elastic auxiliary contacts and an arc-extinguishing enclosure to efficiently manage on/off loading currents.
In normal operations, the fuse link tightens the fuse tube into a secure closed position. Should the system encounter faults, the fault current instantly melts the fuse link, producing an electric arc. This process heats the arc-extinguishing tube, causing it to release substantial gas, resulting in high pressure and a subsequent bowing of the arc along the tube. Once the fuse link has melted, the moving contact loses its tension, triggering the mechanism to lock and causing the fuse tube to drop out, transitioning the cutout to an open position. For switching off during cutout loading, the operator uses an insulating operating bar to pull the moving contact. Initially, the main contact and auxiliary static contact remain connected. As the auxiliary contact is drawn apart, an electric arc forms between the auxiliary contacts, which elongates within the arc-extinguishing enclosure gap. Concurrently, the arc-extinguishing enclosure releases gas to extinguish the arc as it passes through zero current.
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. is a beacon of innovation in electrical integration, standing proudly as a high-tech enterprise. With a dedicated team of experts in R&D, production, and service boasting over 15 years of stellar industry experience, we are at the forefront of technological advancements.
At the heart of our offerings are cutting-edge high-voltage solid-state soft starters, state-of-the-art capacitor cabinets, versatile high and low voltage switchgear, pioneering gas-insulated switchgear, and robust substations. Our products grace a wide array of industries, prominently serving sectors like energy, chemical, metal smelting, and power grids. Additionally, we cater to industrial manufacturing, prestigious universities, leading research institutions, the dynamic medical and pharmaceutical fields, municipal commerce, essential water conservancy and hydropower projects, road traffic solutions, and vibrant commercial and residential landscapes.
Driven by a relentless pursuit of technological innovation and guided by our 'smart manufacturing' doctrine, we are resolute in attracting top-tier technical talent to bolster our core competitive edge. We are unwavering in our mission to deliver unrivaled value to our clientele and are passionately committed to establishing ourselves as a preeminent brand in the industry. Our journey has been one of profound transformation—progressing from humble beginnings to remarkable excellence. With a steadfast focus on innovation, we champion a modern business ethos characterized by quality-driven survival, market alignment, reputation-fueled growth, and management-led efficiency. Our commitment is rooted in 'technology as the guide, standardized management, excellence in quality, and customer satisfaction,' which fortifies our market position and propels us towards ambitious goals in China's electric power and grid sectors. Integrity forms our foundation, quality is our hallmark, and ultimate service is our pledge, with customer satisfaction as our eternal promise. As such, we pursue excellence, embrace continuous innovation, and are devoted to building a brand worthy of your trust. Your recognition fuels our journey forward. We extend heartfelt gratitude to our loyal customers, both new and long-standing, for their unwavering support. Senhang Technology is excited to forge ahead with you, shaping a future filled with promise and innovation.
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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