VTZ-40.5 indoor fast vacuum circuit breaker (Tongzhong Electric's special model) is an indoor switchgear for rated voltage 40.5kV, AC 50/60Hz. It adopts a modular operating mechanism and is suitable for various industrial and mining enterprises and power grid equipment. The trolley unit is used in conjunction with the KYN61 switchgear. It can also be used as a fixed unit with corresponding mechanical interlocking for fixed cabinets such as XGN-40.5.

product-611-713

product-1600-1200

Product Specifications

Specification Sheet

No.	Name	Unit	Data
1	Rated Voltage	kV	40.5
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 Lightning 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	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	18±1
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(31.5kA)
6	Closing Time	ms	20～50
7	Opening Time	ms	≤20
8	Contact Bouncing Duration at Closing Operation	ms	≤3
9	No-Simultaneity of Closing/Opening Operations of 3-Phase	ms	≤2

Product Advantages

Performance of the circuit breaker

E2-C2-M2

Simple and reliable structure

Permanent magnet mechanism, three-phase independent design.

High conductivity

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

High adaptability

This product is fully compatible with conventional KYN61-40.5 series cabinet switches, eliminating the need for special cabinet design and making it suitable for a variety of power conversion environments.

Product Applications

Power plants

Industrial sectors (chemicals, steel, petroleum, coal, etc.)

Grid system

Power infrastructure

Product Outline Drawing

VTZ-405 indoor fast vacuum circuit breaker drawing

Product wiring diagram

VTZ-40.5 indoor fast vacuum circuit breaker are customized products, and the secondary line method must be determined according to the user's operating environment.

select a high-quality supplier for 40.5KV indoor vacuum circuit breakers

40.5kV intelligent vacuum circuit breakers are crucial protection and control devices in power systems, used for the opening and closing operations of high-voltage transmission and distribution lines. Selecting a high-quality 40.5kV intelligent vacuum circuit breaker requires comprehensive consideration of multiple factors, including product performance parameters, reliability, level of intelligence, after-sales service, and technical support.

Why Choose Us

product-717-476

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.

After-sales and Service

We are committed to providing exceptional after-sales support to our global customers. Our services include worldwide technical support and warranty coverage, such as online remote technical support, video training, and on-site installation guidance. During the warranty period, we respond quickly to equipment defaults, and provide repair or replacement services, with the option to extend warranties as needed. To ensure effective communication, we also offer multilingual support and provide a comprehensive feedback mechanism that allows us to track customer satisfaction and continuously improve our service quality.

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.

Honors And Certifications

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