Chapter 3 - 7SR157 Performance Specification
© 2022 Siemens Protection Devices Limited
Chapter 3 - Page 9 of 18
1.4
Environmental Performance
1.4.1
General
1.4.1.1 Temperature
IEC 60255-1 & IEC 60068-2-1/2
Type
Level
Operating range
-10
C to +55
C
Storage range
-25
C to +70
C
1.4.1.2 Humidity
IEC 60255-1 & IEC 60068-2-78
Type
Level
Operational test
56 days at 40
C and 93 % relative humidity
1.4.1.3 Impulse (Transient Overvoltage)
IEC 60255-27
IEC 60255-5 (withdrawn)
Type
Level
Between all terminals and earth, or
between any two independent circuits
5.0 kV, 1.2/50
s 0.5j
1.4.1.4 Dielectric Insulation
IEC 60255-27
IEC 60255-5 (withdrawn)
Type
Level
Between any terminal and earth
2.5 kV AC RMS for 1 min
Between independent circuits
Across normally open contacts
1.0 kV AC RMS for 1 min
1.4.1.5 Installation Category
IEC 60255-27
Type
Level
Installation Category (Overvoltage Category)
Class III
1.4.1.6 Pollution
IEC 60255-27
Level
Pollution Degree 2
1.4.1.7 IP Ratings
IEC60529
Type
Level
Installed with cover on
Front
IP 51
Rear Enclosure (case)
IP 20
Installed with cover removed
Front
IP 20
Rear Enclosure (case)
IP 20
Rear wiring terminal access
IEC 60255-27:2014 (5.1.5.2.6)
IP 10
Содержание 7SR157 Argus
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