VTZ-40.5K vacuum circuit breaker is a 40.5kV vacuum circuit breaker from our company's VTZ modular mechanism series, which has been extensively optimized and improved in mechanical transmission, main structure, and secondary circuits. It is a fixed installation of indoor switchgear component for rated voltage 40.5kV, AC 50HZ.

Product Specifications

Specification Sheet

No.	Name	Unit	Data
1	Rated Voltage	kV	40.5
2	Rated Frequency	Hz	50
3	Rated Current	A	630/1250/1600/2000/2500/3150/4000
4	Rated Power Frequency Withstand Voltage	kV	95
5	Rated Lightning Impulse Withstand Voltage	kV	185
6	Rated Short-Circuit Breaking Current	kA	25/31.5/40
7	Rated Short-Circuit Making Current (Peak)	kA	63/80/100
8	Rated Withstand Current (Peak)	kA	63/80/100
9	Rated Duration of Short-Circuit	s	4
10	Operating Cycles at Rated Short-Circuit Breaking Current	Cycles	E2
11	Mechanical Endurance	Times	10000
12	Standard Operating Sequence	-	O-0.3s-CO-180s-CO
13	Allowable Wear Thickness of Contact	mm	≤3

Mechanical Characteristics

No.	Name	Unit	Data
1	Clearance between Moved and Fixed Contact	mm	19±2
2	Contact Overtravel	mm	4±1
3	Average Closing Speed	m/s	0.8±0.2
4	Average Opening Speed (Average Speed of First Opening at 12mm)	m/s	1.7±0.3
5	Rated Contact Pressure	N	3100±200N (25kA/31.5kA) 4800±300N(40kA)
6	Closing Time	ms	30～70
7	Opening Time	ms	20～50
8	Contact Bouncing Duration at Closing Operation	ms	≤3
9	No-Simultaneity of Closing/Opening Operations of 3-Phase	ms	≤2

Product Advantages

VTZ-40.5K vacuum circuit breaker has many advantages:

Breaker Performance

E2-C2-M2

Convenient maintenance

The modular mechanism design allows for easy replacement of the closing and opening coils without the need for disassembling other components. This eliminates the need for testing or adjustment after replacement, ensuring users can replace them independently, making subsequent maintenance more convenient.

High Conductivity

The optimized insulated cylinder structure and high performance flexible connection embedded pole reduce contact resistance, ensuring reliable power supply.

Strong adaptability

This series of switches can be equipped with opening interlocks and main shaft interlocks, and can be designed with interlocks according to user requirements. Special chassis truck can also be designed and modified according to user cabinet needs for convenience.

Wide range of use

The product is designed to withstand harsh environments, including temperatures as low as -25°C, and meets the requirements for operation at altitudes of up to 2000 meters.

Product Applications

VTZ-40.5K vacuum circuit breaker has many applications:

New energy fields (photovoltaic, wind power)

Industrial fields (chemical industry, steel, petroleum, coal, etc.)

Power grid systems

User product project upgrades

Power infrastructure

Product Outline Drawing

VTZ-405K Vacuum Circuit Breaker manufacturer

Figure 1: VTZ-40.5K embedded pole circuit breaker (rated current ≤ 2500A)

Model	Distance between phases P	Fixed hole distance L1	Box width L2	Remarks
VTZ-40.5K-P300-1231	300	750	850
VTZ-40.5K-P400-1231	400	950	1050
VTZ-40.5K-P440-1231	440	1030	1130
VTZ-40.5K-P460-1231	460	1070	1170
VTZ-40.5K-P480-1231	480	1110	1210

Remarks:

1. 1231 in the model number represents rated current 1250A, rated breaking current 31.5kA;

2. When the distance between phases is 300, it is necessary to increase the insulating partition; the insulating partition is recommended to come with the cabinet;

3. When used in high altitude areas, the air distance needs to be corrected according to the actual requirements.

VTZ-405K Vacuum Circuit Breaker factory

Figure 2: VTZ-40.5K embedded pole circuit breaker (rated current 3150A and 4000A)

Secondary Wiring Diagram

VTZ-405K Vacuum Circuit Breaker supplier

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.

Adapting to industry trends
Guided by our strategic development plan, we continuously adapt our products to align with the latest trends in smart grids, power system automation, and high altitude environments. Our leading high-current, high-voltage, and long-life products are designed to meet the rigorous demands of today's power systems, providing our customers with reliable, maintenance-free solutions that stand the test of time.

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.

Commitment to Excellence
At Shaanxi West Power Tongzhong Electrical Co., Ltd., our commitment to excellence is evident in every aspect of our business. From our R&D initiatives to our manufacturing processes, we strive to deliver the highest quality products and services. By continuously improving our management practices, integrating top talent, and leveraging exceptional social resources, we are building a robust industrial chain that encompasses the research, production, and supply of high-quality electrical products.

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Products

VTZ-40.5K Vacuum Circuit Breaker

Product Specifications

Product Advantages

Product Outline Drawing

Secondary Wiring Diagram

why choose us