Environmental Conditions
Temperatures
Type test, in operation
(in compliance with IEC 60068-2-1 and
IEC 60068-2-2, test Ad for 16 h and test Bd
-25 °C to +85 °C
Recommended for uninterrupted duty
(in compliance with IEC 60255-1)
-10 °C to +55 °C
Temperatures for continuous storage
-25 °C to +55 °C
Type test, transport and storage for 96 h
-40 °C to +70 °C
Humidity
Permissible humidity stress
(according to IEC 60068-2-30)
≤ 75 % relative humidity on the annual average
Up to 93 % relative humidity
Devices subjected to condensation are not to be oper-
ated!
Arrange the devices so that they are not exposed to
direct sunlight or extreme temperature changes. This
will prevent condensation in the device.
Constant humid heat, 56 days
40 °C, 93 % relative humidity
Humid heat, cyclical
12 h + 12 h cycles
25 °C / 55 °C / 95 % relative humidity
Other Environmental Information
Maximum altitude above sea level
2000 m (6561.68 ft)
Minimum admissible atmospheric pressure
783.8 hPa
2.7
2.7.1
2.7.2
2.7.3
7XR8004 – Resistor Coupling Unit for 7XT71
2.7 Environmental Conditions
SIPROTEC, Coupling Units for Generator Protection, Manual
35
C53000-H5040-C072-1, Edition 09.2018
