General Description ZW32-12 type outdoor high voltage vacuum circuit breaker is three-phase AC,50(60) Hz outdoor power distribution equipment with the rated voltage of 12kV.It is mainly used to break and close the load current,and short circuit current in the electric power system.It fits to be used to protect and control the circuit in substation,mining and industrial enterprises.It also can be used in the frequently operation places such as the rural power network. The product is accordance with GB1984-2003 standard. The ZW32-12G VCB -Isolating switch combination consists of Vacuum circuit breaker body and isolating switch. Applying ambient conditions 1. Ambient temperature:-30ºC~+40ºC. 2. The height above sea level:≤1000m(besides the special requirements). 3. Relative humidity:the average humidity of a day should be no more than 95%;the average humidity of a month should be no more than 90%. 4. Saturated vapor pressure:the average pressure of a day should be no more than 2.2kPa:the average pressure of a month should be no more than 1.8kPa. 5. Earthquake intensity:not exceed 8 degrees. 6. Wind pressure should be no more than 700pa(it is equivalent to wind sped of 34m/s). 7. The air filthy should be within III degree. 8. It should be installed in the places without fire,explosion,serious filth, chemical erosion and violent vibration.