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----OPEN GROUP HOLDING LTD. is located in Liushi, Wenzhou, Zhejiang Province, China. It faces the 104 National Highway that run-through Zhemin Economic Zone, close to Qili Harbor and Wenzhou Airport on the south, close to the scenic spot Yandang Mountain on the north.

Quality assurance and customer satisfaction lead Open Group's top belief. OPEN GROUP HOLDING LTD. is one of the most professional manufacturers producing low-voltage and high-voltage electrical products, power equipment, cables & wires, etc. Through last 10 years' development,OPEN GROUP HOLDING LTD. has grown up as one of the biggest group companies in China, and the products range includes lightings, and lamp. We have over fifty member factories for the products above, and our products include 1,500 series and more than 15,000 industrial components.

We have precious experiences in exporting our products to the Southeast Asian, Australian, European and the American markets. Our products are well-known greatly due to high quality and reasonable price. After more than 10 years' promotion and service in the world, our products are enjoying a great share in the international market.

To present our customer more considerate service, OPEN GROUP HOLDING LTD. has modernized our production equipment, enhanced production technology and management mode. To form designing, producing, quality checking, selling as an organic whole, from quality control of the input of the raw materials and feedback of the after-sale service, etc., we have introduced TQM and other advanced producing methods to ensure the interest of our customers.

The 21st century is the era of the knowledge economy, full of the fierce competitions of technology and managing mode, but meanwhile, we can tell that there are also so many opportunities to get mutual benefits. Welcome domestic and international friends to cooperate cordially with OPEN GROUP HOLDING LTD. We believe with our best efforts, we can create the prosperity and development for both of our business.

 
 Smallclass HV fuse(20)
     Insulator
     Transducer
     Contact box Type
     Bushing Series
     Insulation tube Series
     Pull pole Series
 Smallclass cable wire(20)
  | Power Transmission & Distribution Equipment >>  Voltage vacuum circuit >> AC Outdoor HV Vacuum Breaker >> ZW□-12GG/630-20
 
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Mostly purpose
ZW□-12GG/630-20type high-voltage dual power inter-transfer decive(hereinafter called device)is composed of one set of high-voltage vacuum vircult breaker and intelligent controller.applied in ac50hz dual power supply system with tated voltage of 12kv ,rated current to 630a,when one way of power supply is cutting off or under voltage,it can automatically transfer into the other normal power supply to ensure the continuity of power supply.meanwhile it owns protection of interlock function for short-circult and over current,which effciently avoid unnecessary power supply impact once more in load fault,for electricity cutting off of common used power supply the device can do auto transfer of standby power supply to ensure safety and reliability,and it also do selective transfer between the two ways according to load requl rement.it is especially applicable as key electric control device of continuous power supply for key localtion where doesnot allow electric cutting off.it is a auto self-transfer product with new design,perfect performance,reliable safety,high automatization and wide use,it ensure the total disconnecting of the tow ways product is applicable for users who require high reliability and safety dual power supply as control and protection for power system.

Technic parameter
item
unit
parameter
rated voltage
kv
12
maximum working voltage
kv
12
rated current
a
630
ka
20
rated short current switching current (peak &#118alue)
ka
50
rated peak &#118alue withstand current
ka
50
1minrated short time withstand current
ka
20
rated insulation level
power frequency withstand coltage
kv
42
lightning impulse withstand voltage(peak &#118alue)
75
rated operating sequence
o-0.3s-co-180s-co
mechanism life
times
10000
breaking current frequency under rated shout circlt
times
30
operating mechanism rated switch-on voltage
v
220
operating mechanism rated switch-off voltage
v
220
contact opening
mm
9±1
overtravel
mm
3
three-phase switching on or off non-synchroneity
ms
≤2
contact closing bounce time
ms
≤2
average switch of speed
s
1.2±0.2
switch-off time
under maximum operation voltage
s
0.025-0.05
under minimum operation voltage
0.03-0.06
switch-on time
s
0.025-0.05
loop resistance
μΩ
≤180
each phase loop dc resistance
mm
3

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