Table 20. Degree of protection of flush-mounted protection relay
Description Value
Front side IP 54
Rear side, connection terminals IP 20
Table 21. Environmental conditions
Description Value
Operating temperature range -25...+55ºC (continuous)
Short-time service temperature range
-40...+85ºC (<16h)
1)2)
Relative humidity <93%, non-condensing
Atmospheric pressure 86...106 kPa
Altitude Up to 2000 m
Transport and storage temperature range -40...+85ºC
1) Degradation in MTBF and HMI performance outside the temperature range of -25...+55 ºC
2) For relays with an LC communication interface the maximum operating temperature is +70 ºC
Transformer Protection and Control
1MRS756891 M
Product version: 5.0 FP1
32 ABB
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