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

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About Us

As a specialized vacuum circuit breaker and relative accessories manufacturer in China, we have profuse designs of ABB and Siemens with series VCB, our price is very competitive because we are a manufacturer, we are the source.

We have more than 20 years of experience in this industry, our VCB are widely export to Southeast Asia, Central Asia and South Amercia, Europe etc.

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