Installation category

Circuit breakers with rated operating voltages of 660V (690V) and below and undervoltage releases, primary coils for power transformers for category IV installation; auxiliary circuits and control circuits for installation category III.

ambient air temperature

The upper limit does not exceed +40 ° C, the lower limit is not lower than -5 ° C, and the average value of 24 h does not exceed +35 ° C

Atmospheric conditions

The relative humidity of the atmosphere does not exceed 50% when the ambient air is +40 ° C