Product Description
General
The Drop-out Fuse and Load-Switching Drop-out Fuse are robust outdoor high-voltage electrical protection devices. These are strategically placed on the high-voltage side of distribution transformers or as supportive links in distribution lines, serving as guardians against transformers and line short circuits, overloads, and providing operational control over current. Their construction includes an insulating bracket and fuse tubes, with static contacts mounted at either end of the insulation bracket. The moving contacts are positioned at the ends of the fuse tube, which itself consists of an inner arc-extinguishing tube and an outer sheath, made from either a phenolic paper tube or an epoxy glass cloth tube. The Load-Switching Drop-out Fuse is enhanced with auxiliary contacts and an arc chute, designed to provide increased operational flexibility and management of current loads.
During regular operations, the tension within the fuse tube keeps the system in a secure closed position. However, when a fault arises, the fault current swiftly melts the fuse and generates an arc. The arc activates the arc-extinguishing tube, which releases a significant quantity of gas, creating high pressure within the tube and generating a vertical wind along the conduit. This mechanism rapidly stretches and elongates the arc. When the fuse is blown, the tension is released, causing the moving contact to disengage, which activates the locking mechanism to release the fuse tube, thus initiating an open circuit. For load handling, an insulating rod is used to manipulate the moving contact. Initially, as the moving and static contacts remain engaged, the arc develops between auxiliary contacts and extends into the arc chute. The arc chute contains gas that aids in extinguishing the arc once the current reaches zero.
Use and Standards
This versatile product is suited for application in 10 to 35KV distribution line branches and the primary side of distribution transformers. It offers robust protection against overloads and short circuits, while also facilitating the separation and recombination of the rated load current with precision.
The product model is specified according to JB/T8321-1996, which outlines the type preparation method for AC high-voltage fuses. Its parameters adhere to the GB15166.3-1994 standards for high-voltage expulsion fuses. Although these standards do not comprehensively define all critical parameters and configurations, adjustments are made in accordance with the interim technical requirements of JB/DQ2139-1986 for 10 to 35KV outdoor high-voltage drop fuses.
Drop-out Fuse Cutouts and Load-Switching Fuse Cutouts serve as essential outdoor high-voltage protective devices. They are integrated with the incoming feeders of distribution transformers or distribution lines, providing essential protection against short circuits and overloading, as well as managing the on/off loading of current. These cutouts consist of insulated insulator supports and a fuse tube. Static contacts are securely fixed to both sides of the insulator support, while moving contacts are attached to the ends of the fuse tube. The fuse tube includes an inner arc-extinguishing tube and can be encased in an outer phenolic compound paper tube or epoxy glass tube. The Load-Switching Fuse Cutout is distinguished by its enforced elastic auxiliary contacts and arc-extinguishing enclosure, which facilitate effective load current switching.
Under normal operating conditions, a tightened fuse link secures the fuse tube in a closed position. When a system anomaly occurs, the resulting fault current promptly melts the fuse, creating an electric arc. This arc causes the arc-extinguishing tube to heat up and emit substantial gas, producing a high-pressure release that propels the arc along the tube. Once the fuse link melts, the moving contact loses its tension, triggering the locking mechanism, which leads to the fuse tube's disengagement, thereby opening the circuit. For load switching, an operator uses an insulating operating bar to manipulate the moving contact. Initially, the main and auxiliary static contacts remain engaged. As the auxiliary contact is further separated, an electric arc occurs between them, which extends along the arc-extinguishing enclosure gap. Concurrently, the arc-extinguishing gas is released to extinguish the arc as the current approaches 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 beacon of innovation in the realm of electrical integration. As a distinguished high-tech enterprise, we pride ourselves on our exceptional R&D, production, and service team, backed by more than 15 years of unparalleled industry expertise.
Our diverse product suite encompasses high-voltage solid-state soft starters, capacitor cabinets, high and low voltage switchgear, gas-insulated switchgear, and substations. These products are integral to an array of sectors, including energy and chemical industries, metal smelting, electric power grids, industrial manufacturing, academia, medical and pharmaceutical fields, municipal commerce, water management, road traffic systems, and both commercial and residential infrastructures.
At the heart of Zhejiang ChaoTai's ethos lies a commitment to technological innovation and a forward-thinking 'smart manufacturing' philosophy. We energetically attract top-tier technical talent to amplify our core competencies, delivering unrivaled services and aspiring to become the industry's foremost brand. Our journey is one of relentless progress—from inception to excellence. We champion innovation, adhere to a modern business model that thrives on quality, targets market-driven expansion, banks on reputation for growth, and seeks efficiency through adept management. Our guiding principles include technology as our beacon, standardized management, superior quality, and unwavering customer satisfaction. These tenets fortify our competitiveness in the market, aiming to serve China's power transmission and distribution landscape with ever-increasing goals of speed, strength, and quality. Integrity, quality, service, and customer satisfaction form the cornerstone of our philosophy. Our relentless pursuit of excellence, commitment to continuous innovation, and dedication to building a trustworthy brand drive us forward. Your recognition fuels our journey. We extend heartfelt gratitude to all our clients for their unwavering support and look forward to forging a brighter future together with Senhang Technology by our side.
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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