Product Description
General
The Drop-out Fuse and Load Switching Drop-out Fuse are robust outdoor high-voltage protective devices essential for electrical safety. Strategically installed on the high-voltage side of distribution transformers or at connection points in distribution lines, they provide reliable protection against transformer and line short circuits, overloads, and enable safe load current handling. The drop-out fuse is ingeniously crafted with an insulating bracket and fuse tubes. Static contacts are securely placed at both ends of the insulation bracket, while moving contacts are installed on the fuse tube ends. The fuse tube itself consists of an inner arc tube and an outer shell of either phenolic paper or epoxy glass cloth tube. The innovative pull load drop-out fuse enhances operational flexibility, incorporating auxiliary contacts and an arc chute designed for efficient load current management.
Under normal circumstances, the drop-out fuse maintains a closed position due to the tension of the fuse tube. In the event of a system failure, the fault current swiftly melts the fuse, creating an arc. This arc energizes the arc tube, which rapidly generates substantial gas volumes, resulting in high pressure within the tube and causing a powerful vertical wind along the conduit. This dynamic action quickly stretches and elongates the arc. Once the fuse blows, the loss of tension allows the moving contact to pivot outward, disengaging the locking mechanism to release the fuse tube, thus achieving the breaking position. For load disengagement, an insulating rod is employed to maneuver the moving contact. Initially, the moving and static contacts remain engaged. Further application of the insulating rod causes the auxiliary contacts to separate, forming an arc. This arc extends within the hood slit, where it encounters gas. As the current reaches zero, the arc extinguishes, ensuring a secure and efficient interruption of the circuit.
Use and Standards
Designed for integration within 10 to 35KV distribution lines, this product excels in managing branching lines and primary sides of distribution transformers. It offers exceptional protection against overloads and short circuits while facilitating seamless separation and combination of the rated load current.
Our product model adheres to the JB/T8321-1996 Method for AC high-voltage fuse types. Parameters are rigorously constructed in alignment with GB15166.3-1994 standards for expulsion fuses, ensuring compliance with the highest industry benchmarks. Where standards lack specification in key parameters or configurations, adjustments are made in accordance with JB/DQ2139-1986 interim technology requirements for 10 to 35KV outdoor high-voltage drop fuses.
Drop-out fuse cutouts and load switching fuse cutouts stand as indispensable outdoor high-voltage protective devices. Positioned strategically at distribution transformer inlets or within distribution lines, they deliver unmatched protection against transformer and line short circuits, overloads, and allow efficient on/off load current management. The drop-out fuse cutout features an insulating support and a fuse tube. Static contacts are fixed on both sides of the insulator support, while moving contacts are positioned at the ends of the fuse tube. The fuse tube comprises an inner arc-extinguishing tube enveloped by an outer phenolic compound paper or epoxy glass tube. The load switching fuse cutout is equipped with enforced elastic auxiliary contacts and an arc-extinguishing enclosure for seamless on-off load current operations.
In standard operation, the fuse link ensures that the fuse tube is securely fixed in a closed position. Upon detecting system faults, the fault-induced current swiftly melts the fuse link, creating an electric arc that heats the arc-extinguishing tube, releasing substantial gas volumes. This process generates high pressure, propelling the arc along the tube. Once the fuse link melts, the moving contact loses tension, triggering a mechanism lock that causes the fuse tube to drop out, shifting the cutout to an open position. When load switching is necessary, operators utilize an insulating operating bar to manipulate the moving contact. Initially, the main contact remains engaged with the auxiliary static contact. Continued pulling causes the auxiliary contact to separate, fostering an electric arc that extends within the arc-extinguishing enclosure gap. Simultaneously, arc-extinguishing gas is released to eliminate the arc as the current nears zero, ensuring a precise and effective current interruption.
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 dynamic realm of electrical integration. Embracing 15+ years of industry prowess, we boast a formidable team of R&D experts, production specialists, and service professionals, committed to delivering cutting-edge solutions.
Our diverse portfolio of state-of-the-art products includes high-voltage solid-state soft starters, capacitor cabinets, advanced high and low voltage switchgear, and sophisticated gas-insulated switchgear and substations. These products are pivotal across a multitude of sectors, encompassing the vibrant energy and chemical industries, metal smelting, expansive electric power grids, industrial manufacturing, esteemed universities, and pioneering research institutions. Furthermore, they are integral to the medical and pharmaceutical domains, municipal commerce, vital water conservancy and hydropower projects, road traffic systems, and both commercial and residential infrastructures.
Rooted in a philosophy of relentless technological innovation and 'smart manufacturing', we at Zhejiang ChaoTai are wholeheartedly committed to attracting top-tier technical talent to amplify our core strengths. Our mission is to offer unparalleled service value and forge an illustrious brand reputation. Since our inception, we've celebrated significant milestones—transforming from humble beginnings to a leader in excellence. By prioritizing quality, championing market-oriented strategies, building a sterling reputation, and optimizing management efficiency, we navigate a path of modern business success. With our guiding principles—'technology as the beacon, rigorous management, superior quality, and unsurpassed customer satisfaction'—we continuously enhance market competitiveness. We proudly serve China's electric power and grid sectors with ambitious goals of unparalleled speed, strength, and reach. Our foundation is integrity, our focus is quality, our priority is service, and our constant aim is customer satisfaction. Driven by the pursuit of excellence and continuous innovation, we are dedicated to establishing a trustworthy brand. Your trust and support fuel our journey. Zhejiang ChaoTai expresses heartfelt gratitude to our loyal partners and eagerly anticipates collaborating in crafting a brighter, more prosperous future together.
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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