Fn7-12DR is of new type indoor use air compressed AC high voltage load switch for breaking and making the circuit of 50Hz,12K.V system unde rated loading and short circuit current.
Ambient temperature scope:form 12℃ to40℃
Heavy cold zone:25℃ allowed
Altitude not more than 1000m
Relative humidity:average everday not exceeding 95%
Monthly average not more than 80%
There shall have no conductive dust,no corrosive gasess,no severe vobaration and impact.no combustion and explosion on the site for switch operating.