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Description
Integrated varistor
Features
Filling degree of
compressed gas cylinders
Vapor pressure over
liquid SF
Vapor pressure as a
function of temperature
Storage
Gas pressures
in kPa at 20°C
44/214
ATTENTION
Switching overvoltages can damage electronic control devices.
➭ Do not switch off inductive consumers in DC circuits.
With the varistor integrated in the motors, the inductances of the circuit-breaker operating
mechanism and the circuit-breaker control system can be operated with DC. The integrated
varistor limits the overvoltage to approx. 500 V and is available for all rated operating
voltages.
18.3
Insulating gas SF
Sulphur hexafluoride SF
parts between each other and against earth potential.
• Non-toxic
• Odorless
• Colorless
• Non-inflammable
• Chemically neutral
• Electronegative
• Heavier than air
1.04 kg SF
/ liter cylinder volume (valid at a max. ambient air temperature of + 65 °C).
6
In the supplied cylinders, about 2/3 of the cylinder volume is liquid at + 20 °C, the rest is
saturated SF
vapor.
6
6
Temperature
Vapor pressure
+ 20 °C
2100 kPa
+ 30 °C
2700 kPa
+ 65 °C
7000 kPa (test pressure of
cylinder)
Store the cylinders in vertical position in a cool place.
Secure the cylinders against accidents.
Rated busbar current [A]
Rated voltage [kV]
Rated lightning impulse withstand voltage
[kV]
Rated short-duration power-frequency
withstand voltage [kV]
Rated functional level [kPa]
Signal "critical functional level"
Min. functional level [kPa]
Signal "pressure too low" [kPa]
Max. functional level [kPa]
Signal "pressure too high" [kPa]
Revision 06 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DB10 • 864-5091.9
6
according to IEC 60 376 is used as insulating gas. SF
6
≤ 185
≤ 85
70
40
50
50
120
120
Busbar housing
≤ 2500, 5000
≤ 40.5
185
190
95
85
120
90
100
100
180
180
insulates live
6
3150, 4000
200
≤ 190
80
≤ 85
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