VTZ-12DM indoor single-phase permanent magnet vacuum circuit breaker(Tongzhong Electric's special model) is an indoor switchgear for rated voltage 12kV, AC 50/60Hz. It adopts a permanent magnet operating mechanism, single-phase control, and a vertical layout structure. It is suitable for special occasions in various industrial and mining enterprises and power grid equipment. It can be used for special occasions such as single-phase grounding faults and switching capacitor banks.

Product Specifications

Specification Sheet

No.	Name	Unit	Data
1	Rated Voltage	kV	12
2	Rated Frequency	Hz	50/60
3	Rated current	A	1250
4	Rated power-frequency withstand voltage	kV	48(Common value) /42(Across the isolating Distance)
5	Rated lighting impulse withstand voltage	kV	85(Common value) /75(Across the isolating Distance)
6	Rated short-circuit breaking current	kA	31.5
7	Rated-short-circuit making current (peak)	kA	80
8	Rated withstand current (peak)	kA	80
9	Rated duration of short circuit	s	4
10	Operating cycles at rated short-circuit breaking current	Times	E2
11	Mechanical endurance	Times	10000
12	Standard Operating sequence	-	O-0.3s-CO-180s-CO
13	All0wable wearing thickness of contacts	mm	≤3

Mechanical characteristics Table2

No.	Name	Unit	Data
1	Clearance between open contacts	mm	11±1
2	Over-travel	mm	3.5±0.5
3	Average closing speed	m/s	0.7±0.2
4	Average opening speed(average speed at 6mm of initial opening)	m/s	1.1±0.2
5	Rated added external contact final force	N	3100±200N(31.5kA)
6	Make time	ms	≤25
7	Breaking time	ms	≤10
8	Contact bouncing duration at closing operation	ms	≤2

Product Advantages

VTZ-12DM indoor single-phase permanent magnet vacuum circuit breaker has many advantages:

Performance of circuit breaker：

E2-C2-M2;

Stable and reliable:

Permanent magnet mechanism, single-phase design, independent control of phases A, B, and C;

High conductivity:

A rational conductive circuit design meets a temperature rise level of 1.1 times the rated current;

High adaptability:

Compact size and independent design make it suitable for a variety of applications.

Product Applications

VTZ-12DM indoor single-phase permanent magnet vacuum circuit breaker has many applications:

Single-phase grounding circuit breaker;

Phase-switching and reactive power compensation site;

Power grid system protection site;

Special testing site

Product Outline Drawing

Secondary Wiring Diagram

The mechanism itself does not have a control unit, and the secondary wiring is as shown below:

The typical wiring diagram of the external permanent magnet controller is as follows:

why choose us

Shaanxi West Power Tongzhong Electrical Co., Ltd. is a leading manufacturer with over 20 years of experience, specializing in high quality 7 to 40.5kV vacuum circuit breakers, switchgears, and a wide range of electrical products. Our advanced manufacturing process ensures reliable, durable solutions, especially our VTZ series vacuum circuit breakers, which are maintenance-free for up to 20 years. With a team of expert technicians, we excel in R&D, manufacturing, and after-sales service for both high and low voltage equipment, delivering excellence at every stage.

Introduction and Location
Founded in 2014, Shaanxi West Power Tongzhong Electrical Co., Ltd. is a leading innovator in the electrical industry with over 20 years of industry experience. Strategically located at No. 1 East Gaoxin Avenue in the High-Tech Development Zone of Baoji City, Shaanxi Province, our prime location offers excellent connectivity through expressways and high-speed railways. This advantageous location allows us to efficiently serve both domestic and international markets, ensuring fast response times and seamless logistics.

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

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Products

VTZ-12DM Indoor Single-phase Permanent Magnet Vacuum Circuit Breaker

Product Specifications

Product Advantages

Product Applications

Product Outline Drawing

why choose us