VTZ-12 indoor phase-controlled high-voltage 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 and is suitable for special occasions in various industrial and mining enterprises and power grid equipment. The trolley unit can be directly used with the KYN28A-12 switchgear, directly replacing the ordinary three-phase integrated vacuum circuit breaker in the existing switchgear.

VTZ-12 indoor phase-controlled high-voltage vacuum circuit breaker

Product Specifications

Specification Sheet

No.	Name	Unit	Data
1	Rated Voltage	kV	12
2	Rated Frequency	Hz	50/60
3	Rated current	A	630/1250
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	25/31.5
7	Rated-short-circuit making current (peak)	kA	63/80
8	Rated withstand current (peak)	kA	63/80
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

No.	Name	Unit	Data
1	Clearance between open contacts	mm	9±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	1.4±0.2
5	Rated added external contact final force	N	2500±200N(25kA) 3100±200N(31.5kA)
6	Make time	ms	15~35ms
7	Breaking time	ms	≤15
8	Contact bouncing duration at closing operation	ms	≤2
9	Closing/opening no-simultaneity of 3-phase contacts	ms	≤2

Product Advantages

VTZ-12 indoor phase-controlled high-voltage vacuum circuit breaker has many advantages:

Performance of circuit breaker：

E2-C2-M2

Simple and reliable structure:

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

HIGH CONDUCTIVITY

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

High conductivity:

Reasonable conductive circuit design meets the temperature rise level of 1.1 times the rated current;

High adaptability:

This product is identical in size to conventional KYN28-12 series cabinet switches, eliminating the need for special cabinet design and making it suitable for a variety of power conversion environments.

Product Applications

VTZ-12 indoor phase-controlled high-voltage vacuum circuit breaker has many applications:

Single-phase grounding circuit breaker

Power grid system protection site

Phase-switching and reactive power

compensation site

Special testing site

Product Outline Drawing

VTZ-12 indoor phase-controlled vacuum circuit breaker drawing

Product wiring diagram

VTZ-12 series phase-controlled circuit breakers are customized products, and the secondary line mode must be determined according to the user's operating environment.

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

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Products

VTZ-12 Indoor Phase-controlled Vacuum Circuit Breaker