Description
The 24kV VMD4 indoor circuit breaker, a new generation high voltage indoor electrical switch, is an independently developed 24kV vacuum circuit breaker of our company. Its main circuit is covered by a three-phase insulating sleeve. Besides, both this main circuit and its operating mechanism-a newly designed mechanism that enjoys a laconic structure and highly reliable performance, adopt the front and rear panel layout. Based on its advanced design and reliable performance, this high voltage indoor circuit device has been applied in various occasions and would gain much more trust and favors from customers.

Features of the 24kV Indoor Vacuum Circuit Breaker
1. This electrical safety switches, the third generation 24kV vacuum circuit controlling equipment, is a meticulously developed and manufactured product of our company;
2. This 24kV indoor vacuum circuit breaker adopts the latest embedded poles which, made by the APG technique, make the extremely low-resistance vacuum interrupter and the main circuit be sealed by the epoxy resin. Therefore, it enjoys a more reliable insulating property;
3. Of an optimized drive system, this power supply short circuit breaker employs a gear drive system instead of the chain drive counterpart, operating in a smoother and securer way;
4. Thanks to its sound performance, this new generation 24kV indoor circuit protection device, completely meeting the requirements for an automatic reclosing lock, is highly qualified for a working occasion where frequent operations or repeated opening and closing of circuits are needed;
5. This indoor vacuum circuit breaker has passed the type tests of Guobiao standards (GB) and IEC standard, as well as the national appraisals;
6. Its mechanical endurance could be up to 60,000 operations;
7. This indoor electrical switch has been exported to over 18 countries around the world.

Wide Application

This 24kV indoor circuit breaker is generally used in the power plants, power grids, metallurgy industry, petrochemical industry and such urban infrastructure constructions as the construction of airport, subway, and office buildings. Besides, it can be applied to control and protect the cable, trolley wire, electric transformer and the generator and capacitor bank of distribution system.

Spring Operating Mechanism

Breaking Brake Buffer

This vacuum circuit breaker is equipped with a high-performance oil buffer which could substantially mitigate the overswing and rebound amplitude of the moving contacts. Over fatigues of the corrugated pipe of the vacuum interrupter, caused by the overswing, could be effectively avoided as well. Therefore, the breaker could enjoy an expanded mechanical endurance.

Optimized Gear Drive System

Since we have improved the overall design of CB’s operating mechanism, this circuit protective equipment enjoys a simple and compact structure and all the components it employs are standard parts that can be used universally. Furthermore, instead of the traditional chain-wheel drive system, this indoor vacuum circuit breaker adopts a unique gear drive system which enables the breaker to run more smoothly and stably, and enjoy an expanded mechanical endurance.

Quality Control System

Before delivery, each circuit breaker would be run in and go through an automatic fault diagnosis. By this way can we lower the earlier failure rate of our products and ensure good quality of the breakers we provide to our customers.

Moreover, to ensure that all the products enjoy a consistent good quality and meet the ISO9001: 2008 standards, we have had every breaker provided to you be manufactured by advanced production processes and go through the conventional tests and inspections. And none a single product would be delivered before the very responsible person submits a test report with his or her signature, a report that could ensure the product tractability and quality of the breakers.

Successful Application of the 24kV Indoor Vacuum Circuit Breaker

Based on its years experience in R&D and manufacture of medium voltage electrical power equipment, Mingde Electrical has established an increasing market in both broad and at home. Its products have been widely used in the power grids of multiple countries and regions. Among those products, the vacuum indoor circuit breakers are specifically welcomed by the southeastern markets and be applied in several major engineering projects in Mid-east. For example, the Tenaga Nasional Berhad, the leading grid company in Malaysia, has adopted this vacuum circuit breaker.

Technical Standards
All technical parameters of breaker completely meet the GB1984 AC high-voltage breaker standard, the GB/T 11022 -1999 common specifications for high-voltage switchgear and control gear standards, the DL403 standard of China's power industry standards, the IEC62271-100 and IEC56 of IEC standards, as well as related standards of other developed industrial countries.

Technical Parameters of the 24kV Indoor Vacuum Circuit Breaker

Boundary Dimension Figure of the 24kV Indoor Vacuum Circuit Breaker

Please be noted: displayed above are the dimension figures of part of our products. If you would like to see more, please contact us.