The vacuum extinguishing switches types VK-7 and VK-7S are applied as mainly contacts of vacuum chamber. Thanks to original construction, their application meets with series environment conditions.
Technical description
The vacuum extinguishing switch consists of two contacts - movable and stationary - enclosed in the vacuum-tight metal-glass housing. The contact plates are made of porous, copper-antimony saturated tungsten. The movable contact base is precisely guided in the self-lubricated sleeve and the motion is enabled by the elastic stainless-steel bellows.
The balance sheet of standard parameters of vacuum chamber types VK-7, VK-7S.
Technical data
Unit
Type
VK-7
VK-7S
Rated Thermal Current
A
250
400
Rated Insulation Voltage
V
1000
1500
Rated Switching Frequency
1/h
720
120
Short-circuit Switching Capabilityin the P-1 series (O-t-C)
A
4000
4500
Rated Power of controlled Motorsfor
1000V in the AC-3 and AC-4 Cattegory
max kW
250
Rated Power of controlled Motorsfor
1140V in the AC-3 and AC-4 Cattegory