12kV VMD2 Indoor Vacuum Circuit Breaker

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The VMD2 indoor vacuum circuit breaker is an independently designed and manufactured medium voltage apparatus that is developed based on the conventional vacuum circuit breaker. It is featured with unique gear drive system, insulated embedded poles, and extremely low-resistance vacuum interrupters. What’s more, this indoor CB’s operating mechanism enjoys a simple structure and reliable performance.

Product Features of 12kV Indoor Vacuum Circuit Breaker
1. This 12kV indoor vacuum circuit breaker, the third generation of our 12kV vacuum circuit breaker, is a carefully designed and manufactured product that enjoys optimized structure and reliable performance.
2. This new generation circuit breaker is equipped with the latest embedded poles whose extremely low-resistance vacuum interrupters and main circuit are entirely sealed by the epoxy resin. Therefore, this CB enjoys a much more reliable insulation property.
3. As an optimized version of conventional CB, this circuit protection device employs the gear drive system instead of the chain drive. Therefore, it could operate in a far more stable way.
4. Thanks to its highly reliable and secure performance, this vacuum circuit breaker, meeting all the requirements for automatic reclosing lock, is quite suitable to be used in a working occasion where repeated operations or breaking of short-cut circuit currents are needed.
5. This 12kV vacuum electrical switch has passed the type tests of Guobiao standards (GB) and IEC standard, as well as the national appraisals.
6. Its mechanical endurance could be up to 60,000 operations.
7. This medium voltage VCB has been exported to over 26 countries around the world.

Wide application of 12kV Indoor Vacuum Circuit Breaker

Thanks to its advanced design and reliable performance, this indoor vacuum circuit breaker could be used in such a wide range of fields as the power grids, hydropower plants, wind power plants, thermal power plants, industrial factories, oil and gas plants, offshore operations, and urban infrastructure constructions. Moreover, the VCB could operate smoothly in such extremely harsh environments as deserts in Mid-east, extremely cold areas in Siberia of Russia, and the plateau areas in western China.

Unique Gear Driven System

Since we have improved the overall design of CB’s operating mechanism, this 12kV indoor circuit breaker enjoys a simple and compact structure and all the components it employs are standard parts that can be used universally. Furthermore, instead of the traditional chain-wheel drive system, this CB adopts a unique gear drive system which enables the breaker to run more smoothly and stably, and enjoy an expanded mechanical endurance.

Spring Operation Mechanism

Circuit control board
The circuit control board of this 12kV indoor vacuum circuit breaker is designed according your specific needs. Different from that of the traditional VS1, this penal is equipped with couples of additional mini fuses which, cheap and easy to replace, could effectively avoid electronic components from being burnt.

Modular Circuit Board

Oil Buffer for Circuit Breaker

This circuit protection device is equipped with a high-performance oil buffer which could substantially mitigate the overswing and rebound amplitude of the moving contacts. Over fatigues of the corrugated pipe of the vacuum interrupter, caused by the overswing, could be effectively avoided as well. Therefore, the breaker could enjoy an expanded mechanical endurance.

Successful Application of 12kV Indoor Vacuum Circuit Breaker

As a reliable electrical equipment manufacturer and supplier, Mingde has been providing equipment to oil and natural gas companies and gained trust and reputation among the customers. In August, 2013, we supplied a batch of VMD2 circuit breakers to a Russian MV switchgear supplier. Besides, our 12kV indoor circuit protection switch have been used in several oil and natural gas companies in Russia.

Technological Parameters of 12kV Vacuum Circuit Breaker

NO.	Item		Unit	Technical Data
1	Rated voltage		kV	7.2 / 12
2	Rated insulating level	Rated short time power frequency withstand voltage(1min)		42
		Rated lighting impulse withstand voltage (peak value)		75
3	Rated Frequency		Hz	50
4	Rated current		A	630	630	1250	1250
				1250	1250	1600	1600
						2000	2000
						2500	2500
						3150	3150
						4000	4000
5	Rated short circuit breaking current		kA	20	25	31.5	40
6	Rated short time withstand current			20	25	31.5	40
7	Rated peak withstand current			50	63	80	100
8	Rated short-circuit closing current (peak value)			50	63	80	100
9	4S rated short-time withstand current 4s			20	25	31.5	40
10	Rated shock steady current			50	63	80	100
11	Duration of rated short-circuit current		S	4
13	Closing time (under Rated voltage)		Sms	35-70
14	Opening time (under Rated voltage)			20-45
15	Average breaking speed			0.9-1.3
16	Average making speed			0.4-0.8
17	Rated operating sequence			O- 0.3 -CO-180s-CO
18	Mechanical life		times	10000, 30000

Boundary Dimension Figure

boundary dimension figure of the
handcart type 12kV indoor
vacuum circuit breaker
(phase space: 150mm)
boundary dimension figure of the
handcart type 12kV indoor
vacuum circuit breaker
(phase space: 210mm)
boundary dimension figure of
the handcart type 12kV indoor
vacuum circuit breaker
(phase space: 270mm)

Please be noted: displayed above are the dimension figures of part of our products. If you would like to see more, please contact us.

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