VTZ-12(K59) vacuum circuit breaker, developed by Shaanxi West Power Tongzhong Electrical Co., Ltd., is specially designed to replace old oil-minimized circuit breakers commonly used in K-59 cabinet types in the Central Asian region. This product features an advanced domestic modular mechanism and is specially designed to suit the climatic characteristics of the Central Asian region. It is suitable for power systems with a rated voltage of 12kV and three-phase AC 50/60Hz. The rated current ranges from 630A to 1600A, and the breaking current ranges from 20kA to 31.5kA. Additionally, the product can be customized to fit existing cabinets used by customers, and it is essentially compatible with the Central Asian region cabinets such as K-37, K-47, KPH-3, K-3-02, and KPH-4-1-10.

Product Specifications

Specification Sheet

No.	Name	Unit	Data
1	Rated Voltage	kV	12
2	Rated Frequency	Hz	50/60
3	Rated Current	A	630/1250/1600
4	Rated Power Frequency Withstand Voltage	kV	48(Across the Contact Gaps) / 42(To Ground)
5	Rated Lightning Impulse Withstand Voltage	kV	75
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	20000
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	9±1
2	Contact Overtravel	mm	3.5±0.5
3	Average Closing Speed	m/s	0.7±0.2
4	Average Opening Speed (Average Speed of First Opening at 6mm)	m/s	1.1±0.2
5	Rated ContactPressure	N	2500±200N(25kA) 3100±200N(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	≤2
9	No-Simultaneity of Closing/Opening Operations of 3-Phase	ms	≤2

Product Advantages

VTZ-12(K59) vacuum circuit breaker has many advantages:

1. Performance of circuit breaker: E2-C2-M2

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

3. High conductivity performance: the product features a well-designed conductive circuit that complements conventional contacts used in the Central Asian region.

4. Stable Performance: the product makes use of professional product production lines and special tools to ensure consistency and reliable performance of the product.

Product Applications

VTZ-12(K59) vacuum circuit breaker has many applications:

Power plants

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

Power grid systems

Power infrastructures

Product Outline Drawing

VTZ-12K59 Vacuum Circuit Breaker manufacturer

Secondary Wiring Diagram

VTZ-12K59 Vacuum Circuit Breaker factory

Special Contact

VTZ-12K59 Vacuum Circuit Breaker factory

Characteristics ：Our K-59 circuit breaker is compatible with the most common contacts in the Central Asia region, supporting rated currents of 630A, 800A, 1000A, 1250A, 1600A, and 2000A.

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.

company

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.

Our Mission and Vision
Since our founding, we have been driven by a mission to revolutionize power transmission and distribution systems. Our vision is to expand our international market share and establish our VTZ brand as a symbol of quality and innovation in the electrical industry. We are committed to becoming a global leader, known for our dedication to advancing technology, ensuring quality, and prioritizing customer satisfaction.

Product Portfolio and Brand Strength
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, they 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. Our VTZ Series have become important switch equipment in major fields and power systems throughout China, and their reputation for reliability has earned us the trust of customers nationwide.

Core Products

Among many offerings, our core product - VTZ Series Vacuum Circuit Breakers stand out for their exceptional quality and performance. Maintenance-free and with a service life of up to 20 years, these products set a new standard in the industry and are known for their simple structure, high reliability, low power consumption and long service life. Meeting and exceeding global standards, They are extensively exported to Central Asia, Southeast Asia, South America, Europe, and other regions.