FN7-12 Type Indoor High Voltage Load Switch and Fuse Combination Appliance

FN7-12 type indoor high-voltage load switch and fuse combination is a new type of gas-producing indoor high-voltage load switch, which is suitable for use in three-phase AC power systems with AC 50Hz and rated voltage of 12KV as a means of breaking load currents and closing short-circuit currents.
It is suitable for AC 50Hz, rated voltage 12KV three-phase AC power system, as the opening and closing of load current and short-circuit current.

a. Ambient air temperature: upper limit: +40℃; lower limit: -10℃ in general area, -25℃ in alpine area.
b. Altitude: altitude of 1000m and below.”        
c. Relative humidity, daily average is not more than 95%, monthly average is not more than 90%.        
d. The surrounding air should be free from corrosive or natural gas and water vapor and other obvious pollution;
e. No regular severe vibration.”