24kV Good conductivity Contact Arm for Vacuum Circuit Breaker is used for withdrawable indoor high-voltage vacuum circuit breaker, suitable for rated voltage 24kV power equipment, and is an important component of the electrical system. It is mainly used to connect and operate the contacts in electrical equipment. It is usually used together with the static contact and the moving contact to form a part of the switch or circuit breaker. During the opening and closing process of the circuit, moved contact will contact or separate with the fixed contact, and the contact arm plays the role of connecting and operating these contacts. Its surface treatment requires processes such as silver plating, heat shrinkage, and vulcanization.

24KV contact box for vacuum circuit breaker

solve three quesions

The 24kV contact arm, as a core conductive connector in medium-voltage switchgear and circuit breakers, primarily addresses three key issues:

1. Solving electrical safety problems (preventing arc discharge): In a 24kV high-voltage environment, during the opening or closing movement of the contact arm, if the insulation distance is insufficient or the design is inadequate, dangerous arc discharge can easily occur between the contact arm and the cabinet casing. High-quality 24kV contact arms typically employ designs such as external insulating sleeves, added insulating flanges or baffles to effectively prevent arcing between the moving contact and the cabinet casing or operating shaft, thereby greatly improving the reliability of the switchgear.

2. Solving heat generation and conductivity efficiency problems (reducing temperature rise and energy consumption): The contact arm is the essential path for current transmission. If the contact arm has poor conductivity or excessive contact resistance, severe heat generation will occur when a large current passes through, leading to increased temperature in the distribution room and even equipment burnout.

Reduced Temperature Rise: High-quality contact arms utilize highly conductive materials, significantly reducing contact resistance (by 30%~50%), thereby lowering the operating temperature rise by 15~20℃.

Enhanced Current Carrying Capacity: Excellent conductivity design enhances current carrying capacity (by approximately 25%) and increases heat dissipation area, breaking through energy efficiency bottlenecks and ensuring long-term electrical safety.

3. Solving Mechanical Lifespan and Operational Stability Issues (Reduced Wear, Extended Lifespan): Contact arms withstand significant mechanical stress during frequent withdrawal of the handcart and opening/closing operations.

Smooth Force Distribution: Good contact arm design (such as transmission via insulated connecting rods on both sides) ensures smooth force distribution, making opening and closing actions more precise and minimizing swing errors.

Extended Lifespan: Excellent mechanical structure reduces friction and mechanical impact during operation, lowering the burden on the operating mechanism and significantly extending the mechanical lifespan of the equipment (e.g., from the conventional 5000 cycles to 10000 cycles or even higher), reducing subsequent maintenance and replacement costs.

Product Specifications

Technical parameters

No.	Name	Unit	Data
1	Rated voltage	kV	24
2	Rated current	A	630/1250/1600/2000/2500/3150
3	Material		Copper-aluminum combination/pure copper
4	Lenth (L)	mm	298-304

Key Features

As an important component of power equipment, 24kV Contact Arm for Vacuum Circuit Breaker is related to the performance and safety of the equipment. Its materials include copper and alloy. As an excellent conductive material, copper has good conductivity and certain mechanical strength, which can meet the basic requirements of high-voltage contact arms. The alloy material provides higher mechanical strength, which can meet the strength requirements of the moving contact arm of the circuit breaker. At the same time, it has good conductivity and is suitable for use in power equipment such as high-voltage switchgear. The mechanical strength of this alloy material reaches the standard of medium-hardness aluminum alloy, the surface strength reaches more than Brinell 128, and the surface is plated with thick silver, which increases the friction coefficient and ensures good conductivity and mechanical strength.

①Good conductivity and mechanical strength

The design and material selection of the contact arm also take into account the conduction and dispersion of heat. For example, the heat dissipation holes on the high-current contact arm, the bolt connection of the contact arm is far away from the static contact, and the heat generated by the eddy current is not concentrated, and can be well conducted out. This design helps to maintain the stable operation of the equipment and avoid equipment damage or safety accidents caused by local overheating.

②Maintaining stable equipment operation

It can also be used in 10kV high altitude areas.

③For use at high altitudes

‌Product Applications

24kV Good conductivity Contact Arm for Vacuum Circuit Breaker is usd to 24kV indoor high voltage vacuum circuit breaker and special truck .It is also used in the following power equipment:

1. 24kV Metal-Enclosed Switchgear (Switchgear)
This is the primary application of 24kV conductive contact arms. Whether armored, bay-type, or box-type switchgear, as long as it uses a withdrawable vacuum circuit breaker, a conductive contact arm is required to ensure reliable conductive connection between the withdrawable circuit breaker in the working and testing positions and the cabinet busbars and cables.

2. Ring Main Unit (RMU)
In 24kV RMUs, if withdrawable circuit breaker modules or load switch-fuse combination switchgear are used, conductive contact arms are also needed to ensure a good conductive circuit and mechanical lifespan for insertion and removal.

3. Prefabricated Substations
The high-voltage compartment of European or American prefabricated substations typically integrates 24kV switchgear. To facilitate maintenance and replacement of core protection components (circuit breakers), prefabricated substations often employ a trolley-type design, making the conductive contact arm a crucial internal conductive connector.

4. Complete Sets of Power Distribution Equipment in Industrial and Specialized Fields
In applications with high power supply reliability requirements, such as petrochemicals, mining, rail transportation, large data centers, and building construction, conductive contact arms are indispensable components in the supporting 24kV high-voltage distribution rooms or complete sets of equipment that utilize withdrawable circuit breaker trolleys.

24kv vacuum circuit breaker

Products oveall outline drawing

24kV Contact Arm for Vacuum Circuit Breaker 630A price

630A

24kV Contact Arm for Vacuum Circuit Breaker 1250A quotation

1250A

24kV Contact Arm for Vacuum Circuit Breaker 1600A supplier

1600A

buyer 24kV Contact Arm for Vacuum Circuit Breaker 2000A

2000A

24kV Contact Arm for Vacuum Circuit Breaker 2500-3150A factory

2500-3150A

Shaanxi West Power Tongzhong Electrical Co., Ltd.

Advanced Manufacturing and Production
We operate one of the most advanced and standardized assembly line manufacturing facilities in the industry, equipped with the latest technology, enabling us to produce a wide range of high quality electrical products with precision and efficiency. Wecomply with GB 1984-2024 and GB/T11022-2020 standards to ensure the highest quality. Our commitment to excellence is reflected in the durability, reliability, and compatibility of our products.

Send Inquiry Now

why choose us

Excellence in research and development

Innovation is at the core of our business. We have independently developed the VTZ Series Vacuum Circuit Breakers and continue to invest in research and development to meet the evolving needs of the electrical industry. Our R&D team consists of senior technical experts with decades of experience in the design and manufacture of high and low voltage electrical equipment. Their expertise, combined with our advanced facilities, allows us to stay ahead of industry trends and continually optimize our product offerings.
Advanced manufacturing and production
We operate one of the most advanced and standardized assembly line manufacturing facilities in the industry, equipped with the latest technology, enabling us to produce a wide range of high quality electrical products with precision and efficiency. Wecomply with GB 1984-2024 and GB/T11022-2020 standards to ensure the highest quality. Our commitment to excellence is reflected in the durability, reliability, and compatibility of our products.
Wide range of products

We offer a wide range of products, including indoor and outdoor vacuum circuit breakers, switchgear, low voltage switch equipment, and various electrical accessories. Each product is designed to meet the specific needs of our customers, and can operate stably in urban distribution networks, industrial melting, new energy power generation, rural power supply and other places, and can still maintain excellent reliability even in harsh environments.

Hot Tags: 24kV Good conductivity Contact Arm for Vacuum Circuit Breaker, China 24kV Good conductivity Contact Arm for Vacuum Circuit Breaker manufacturers, suppliers, factory, contact arm for vcb, 24kV Contact Arm for Vacuum Circuit Breaker, 12kV Contact Arm for Vacuum Circuit Breaker