7SR21 & 7SR22 Performance Specification
Unrestricted © 2013 Siemens Protection Devices Limited Page 17 of 68
1.4 Environmental Performance
1.4.1 General
1.4.1.1 Temperature
IEC 60068-2-1, IEC 60068-2-2
Type Level
Operating range
- 10 °C to + 55 °C
Storage range
- 25 °C to + 70 °C
1.4.1.2 Humidity
IEC 60068-2-30, IEC 60068-2-78
Type Level
Operational test (Indoor)
56 days at +40 °C and 95 % relative humidity (r.h.)
Operational test (Outdoor)
6 cycles at 24 h between +25 °C (97% r.h.) and +55 °C (93% r.h.)
1.4.1.3 Transient Overvoltage
IEC 60255-5
Type Level
Between all terminals and earth, or
between any two independent circuits
5.0 kV, 1.2/50 ms 0.5j
1.4.1.4 Insulation
IEC 60255-5
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 IP Ratings
Type Level
Installed with cover on
IP 51 from front of relay
IP 10 from rear of relay
Installed with cover removed
IP 20 from front of relay
IP 10 from rear of relay
To Next Page
Loading...
