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