Product Description
General
The drop-out fuse and pull load drop-out fuse serve as crucial outdoor high-voltage protection mechanisms for electrical systems. Positioned on the high-voltage side of distribution transformers or as a supportive link in distribution lines, these devices act as guardians against short circuits and overloads, while facilitating the opening and closing of co-load currents. Constructed with a robust insulating bracket and fuse tubes, the static contacts are firmly anchored at each end of the bracket, while dynamic contacts are installed on each end of the fuse tube. The fuse tube itself is a composite of an inner arc tube and an outer layer made from phenolic paper or epoxy glass cloth tubes. In addition, the pull load drop-out fuse integrates enhanced flexibility with auxiliary contacts and an arc chute to optimize the management of open and co-load currents.
During normal operations, the drop-out fuse maintains a closed position through the tension in the fuse tube. When a system failure occurs, the fault current promptly blows the fuse, generating an arc. This arc ignites the arc tube, which releases substantial amounts of gas, creating high pressure and forming a vertical airflow within the tube. This process rapidly stretches and elongates the arc. Once the fuse blows, the moving contact loses tension, unlocking the mechanism and releasing the fuse tube to drop, thereby forming a breaking position. When it is necessary to pull the load, an insulating rod is used to disengage the moving contact, while the moving and static contacts remain in contact. Continuing to pull with the insulating rod separates the auxiliary contacts, causing an arc to appear and stretch within the hood slit. The arc cover contains gas, and as the current reaches zero, the arc is extinguished.
Use and Standards
This product specifically caters to 10 ~ 35KV distribution lines, branching lines, and the primary side of distribution transformers. It is essential for providing robust overload and short circuit protection, as well as facilitating the separation and combination of rated load currents.
The product model adheres to the JB/T8321-1996 Method for preparing type AC high-voltage fuses, while its parameters are crafted according to the GB15166.3-1994 standards for high voltage expulsion fuses. Although the standards lack explicit definitions for key parameters and configurations, corrections are guided by the JB/DQ2139-1986 interim technology requirements for 10 ~ 35KV outdoor high-voltage drop fuses.
Drop-out fuse cutouts and load switching fuse cutouts are invaluable outdoor high-voltage protective devices. They can be connected to the incoming feeders of distribution transformers or lines, primarily safeguarding transformers and lines from short circuits, overloads, and handling on/off loading currents. Comprising insulative supports and a fuse tube, the static contacts are secured on either side of the insulator support, while moving contacts are installed on the fuse tube's ends. The fuse tube features an inner arc-extinguishing tube and an outer layer made from phenolic compound paper or epoxy glass. Load switching fuse cutouts offer augmented elastic auxiliary contacts and an arc-extinguishing enclosure for efficient on-off load current management.
Under normal working conditions, the fuse link tightens the fuse tube into a closed position. In the event of a system fault, the fault current swiftly melts the fuse, generating an electric arc that heats and expels a large volume of gas from the arc-extinguishing tube. This process creates high pressure and directs the arc flow along the tube. Once the fuse melts, the moving contact loses its tension, locking the mechanism and causing the fuse tube to drop out, resulting in the cutout reaching an open position. For switching off during cutout loading, an operator uses an insulating operating bar to pull the moving contact. Initially, the main contact and auxiliary static contacts remain connected. As the auxiliary contact is pulled, an electric arc forms between the auxiliary contacts, lengthening within the arc-extinguishing enclosure gap. Simultaneously, the arc-extinguishing process expels gas to extinguish the arc as the current reaches 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 is a distinguished high-tech enterprise pioneering the electrical integration industry. We boast an expert R&D, production, and service team enriched with over 15 years of profound industry expertise.
Our innovative portfolio includes high-performance high-voltage solid-state soft starters, advanced capacitor cabinets, sophisticated high and low voltage switchgear, state-of-the-art gas-insulated switchgear, and robust substations. Our cutting-edge products are integral to numerous sectors, including the energy and chemical industries, metal smelting, electric power grids, and industrial manufacturing. Additionally, they are pivotal in academic institutions, medical and pharmaceutical sectors, municipal commerce, water conservancy, hydropower, road traffic, as well as commercial and residential areas.
Driven by a commitment to technological innovation and a 'smart manufacturing' ethos, we actively recruit top-tier technical talent to elevate our company's core strengths. Our mission is to deliver unparalleled value to our clients while aspiring to establish ourselves as the industry's leading brand. From our inception, we have consistently forged ahead, transforming from inception to excellence. We prioritize innovation and adhere to a modern business approach focused on quality for survival, market orientation, reputation for development, and efficiency through meticulous management. Our devotion to 'technology as the guide, standardized management, exceptional quality, and customer satisfaction' underscores our quality and technical talent management, boosting our market prowess, and aiming to excel in China's electric power and grid transmission and distribution sectors with ever-higher goals. At the heart of our philosophy is integrity, unmatched quality, superior service, and our perpetual commitment to customer satisfaction. Striving for excellence, continuous innovation, and crafting a reliable brand are our steadfast development goals. Your trust is our motivation. We extend heartfelt gratitude to our esteemed new and longstanding customers for their unwavering support and loyalty, and look forward to collaborating with you to bring about 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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