Description
44/214 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
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