· Ambient temperature :-5℃~+40℃.
·Elevation of installation site:≤2000m.
·Relative humidity: not exceeding 50% at the maximum ambient temperature of +40℃. With the lower temperature, higher humidity would be permitted. E.g. when the relative humidity is 90% at the ambient temperature of 20℃，special measures should be taken to solve the dews on the surface, which would appear due to the temperature change.
·Pollution protection: 3 grade.
·Breakers pass the GB/T2423.10 which can tolerate the mechanical vibration(frequency:2Hz~13.2Hz,displacement:±1 and frequency:13.2Hz~100Hz,acceleration：±0.7g).
·Installing categories: III for the main circuits; II for auxiliary circuit and control circuit without connecting with the main circuit.
·Breakers can be used in electromagnetic environment A.
·Humid and tropical type (TH)breakers pass the GB/T2423.4, which can tolerate the Influence of damp air、salt mist、oil mist and mould.
·Breakers should be installed in the place without any explosive medium,conductive dust and can not corrode metal and destroy the insulation.
·The place would not be invade by rain and snow.
·Storage condition: Ambient temperature is -40℃~+70℃.