ZN85B-40.5 miniaturized indoor vacuum circuit breaker is a miniaturized 40.5kV product designed and developed by our company.
It can perfectly replace the VD4-40.5 and HD4-40.5 series floor trolleys produced by ABB.
This series mainly includes two series: permanent magnet mechanism and spring mechanism.
It is a rated voltage 40.5KV, AC 50HZ indoor switchgear component.

product-1600-2740

Table 1 Main Performance Parameters of Circuit Breakers

S.N	Item name			Unit	Parameter
1	Rated voltage			kV	40.5
2	Rated insulation level	Lightning Impact Withstand Voltage			185(Interphase, to ground) 215(fracture)
		Power frequency withstand voltage(1min)			95
3	Rated frequency			Hz	50
4	Rated current			A	630	1250
5	Rated short circuit breaking current			kA	31.5
6	Rated operating sequence				O-0.3s-CO-180s-CO
7	Rated short circuit making current(peak)			kA	80
8	Rated peak withstand current (rated dynamic stability current)				80
9	Rated short-time withstand current (rated thermal stability current)			kA	31.5
10	Rated short-circuit duration (rated thermal stabilisation time)			s	4
11	Opening and closing individual capacitor bank current			A	400
12	Rated out-of-step breaking current			kA	6.3
13	Cumulative number of openings at rated short-circuit breaking current			times	8
14	Cumulative number of openings at rated current			times	3000
15	mechanical life			times	10000
16	Rated pressure of sulphur hexafluoride gas (gauge pressure at 20°C)			MPa	0.65
17	Sulphur hexafluoride gas blocking pressure (gauge pressure at 20°C)				0.59
18	Annual air leakage rate			%/year	≤1
19	Sulphur hexafluoride gas moisture content (at 20°C)			ppm (V/V)	≤150
20	Rated operating voltage			V	AC/DC: 110/220
21	Weight		circuit breaker body	kg	130
			Sulphur hexafluoride gas		1.5

Table 2 Assembly adjustment parameters for circuit breakers

S.N	Item name	Unit	Data
1	Total travel of the conductive rod	mm	61±2
2	contact opening distance	mm	40±2
3	overstroke	mm	20±2
4	Closing time	ms	40≤t≤100
5	Opening time	ms	25≤t≤60
6	Closing bounce	ms	≤2
7	Opening bounce	mm	≤2
8	Rigid closing speed(18-0mm)	m/s	2.1±0.2
9	Rigid opening speed(0-18mm)	m/s	2.3±0.2
10	Three-phase switching and closing non-simultaneity	ms	≤2
11	Dimension of the upper end of the conductive rod from the upper end of the insulating cylinder in the electrically closed position A	mm	84±1.5
12	Minimum air insulation distance	mm	300
13	Conducting main circuit DC resistance per phase	μΩ	≤80

Circuit breaker performance: E2-C2-M2
Simple and convenient maintenance: The spring mechanism adopts a modular mechanism. The replacement of the closing and opening coil does not require the removal of other components. The user can easily replace it, and no test and adjustment are required after replacement, making the later operation and maintenance more convenient. The life of the permanent magnet mechanism can reach 30,000 times, and it is basically maintenance-free.
High conductivity: The optimized insulation cylinder structure and high-performance soft connection sealed pole are adopted to reduce contact resistance and ensure power supply reliability.
Wide range of use: Adapt to harsh environments, the product can withstand low temperatures of minus 25℃. Meet the use requirements of 2000 meters above sea level.
Economical and affordable: Compared with the high-priced VD4-40.5 series products on the market, our company's ZN85G-40.5 is economical and cost-effective.

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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