Product Description
General
The drop-out fuse, along with the load pull drop-out fuse, is an essential component for outdoor high-voltage electrical protection. Designed to be installed on the high-voltage side of distribution transformers, or as a support link within distribution lines, it acts as a guardian against transformer and line short circuits, overloads, and co-load currents. Constructed with insulating brackets and fuse tubes, each end of the bracket is fixed with static contacts, while the fuse tube holds moving contacts at both ends. This tube comprises an inner arc tube and an outer layer made of robust phenolic paper or epoxy glass cloth. The pull load drop-out fuse boosts operational flexibility with auxiliary contacts and an arc chute that expertly manages open and co-load current situations.
Under normal operating conditions, the drop-out fuse remains in a steadfast closed position, maintained by the tension of the fuse tube. However, when a fault in the system arises, the fault current swiftly blows the fuse, initiating an arc formation. This arc burns the arc tube, releasing a substantial amount of gas. The resultant high pressure, along with a vertical wind through the pipeline, quickly stretches and elongates the arc. Upon the fuse's rupture, tension is lost, and the moving contact pivots outward, unlocking the mechanism and allowing the fuse tube to drop, thus creating an open circuit position. During load operations, an insulating rod is employed to disengage the moving contact. Initially, both moving and static contacts remain engaged. With continued pulling of the insulating rod, auxiliary contacts detach, creating an arc that extends within the hood slit. The arc cover releases gas, extinguishing the arc when the current reaches zero.
Use and Standards
This versatile product is engineered for use on 10 to 35KV distribution lines, branching lines, and the primary side of distribution transformers. It provides reliable overload and short circuit protection, ensuring effective separation and combination of the rated load current.
The product model is meticulously prepared in accordance with JB/T8321-1996 Method of Type AC High-Voltage Fuses. Its parameters are crafted to meet the stringent requirements of GB15166.3-1994 High Voltage Fuses Expulsion Fuses standards. In instances where important parameters and configurations are not distinctly defined, compliance with JB/DQ2139-1986's interim technology mandates for 10 to 35KV outdoor high voltage drop fuses is ensured.
Drop-out fuse cutout and load switching fuse cutout serve as vital high voltage protective devices for outdoor applications. These devices are seamlessly connected with the incoming feeder of a distribution transformer or distribution lines, safeguarding transformers and lines from short circuits and overloads, while managing on/off loading currents. Featuring insulator supports and a fuse tube construction, static contacts are affixed at both ends of the insulator support, while moving contacts are mounted at each end of the fuse tube. The fuse tube integrates an inner arc-extinguishing tube and is enveloped by a durable phenolic compound paper or epoxy glass tube. The load switching fuse cutout enhances operational efficacy with reinforced elastic auxiliary contacts and an arc-extinguishing enclosure that facilitates seamless switching of on-off loading currents.
During normal operations, the fuse link secures the fuse tube in a closed position. In the event of a system fault, the ensuing fault current swiftly causes the fuse to melt, creating an electric arc. This prompts the arc-extinguishing tube to heat up and release a copious amount of gas, generating high pressure and driving the arc along the tube. Once the fuse link melts, the moving contact loses its tension, the mechanism locks, and the fuse tube drops out, transitioning to an open position. When a cutout is required during load operations, the operator uses an insulating operating bar to disengage the moving contact. Initially, the main and auxiliary static contact maintain contact. As pulling progresses, the auxiliary contacts separate, sparking an electric arc that elongates within the arc-extinguishing enclosure. Simultaneously, the arc-extinguishing gas explodes, extinguishing 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 pioneering high-tech enterprise dedicated to the forefront of electrical integration, boasting a distinguished R&D, production, and service team with a wealth of over 15 years of illustrious industry experience.
Our exceptional product lineup features innovative high-voltage solid-state soft starters, sophisticated capacitor cabinets, versatile high and low voltage switchgear, advanced gas-insulated switchgear, and reliable substations. These outstanding products find their applications across diverse sectors including energy and chemical industries, metal smelting, electric power grids, industrial manufacturing, prestigious universities and research institutions, the dynamic medical and pharmaceutical sectors, municipal commerce, vital water conservancy and hydropower, road traffic management, and in bustling commercial and peaceful residential areas.
Firmly committed to relentless technological advancement and the visionary philosophy of "smart manufacturing," we actively attract top-tier technical talent to significantly bolster our company's core competitive edge. Our mission is to deliver unparalleled value to our esteemed customers while aspiring to become the industry's premier brand. Since its inception, our company has shown remarkable progress, evolving from a nascent entity to a leader of excellence. Embracing innovation, our modern business strategy prioritizes quality as the cornerstone of survival, a market-oriented approach for growth, reputation-centric development, and efficiency through superior management. Our commitment to "technology-led guidance, standardized management, exceptional quality, and unmatched customer satisfaction" underpins our quality and technical talent management, enhancing our market dominance. We aim to serve China's electric power and grid's transmission and distribution sectors with speedier, more robust, and superior goals. Our guiding principles are founded on unwavering integrity, unmatched quality, supreme service, and perpetual customer satisfaction. Our company is steadfast in pursuing excellence, continuous innovation, and establishing a trusted brand. Your recognition fuels our ambition, and we extend our heartfelt gratitude to our loyal customers, both new and old, for their unwavering support. Senhang Technology eagerly anticipates forging a prosperous future hand in hand with you.
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.
Audited Supplier 
){kind=link}