Vacuum circuit breaker ZN85A-40.5

magneticvoltagethree-phase

General ZN85A-40.5(30AV7)indoor high voltage AC vacuum circuit breaker is applied to the systems of 3-phase AC 50HZ,35KV in industrial and mineral enterprises,power plant and substations for cutting and closing load current,overload current and failure current.It is also suitable for the sites where frequent operations are required. The breaker conforms to the requirements of the standards of GB1984-1989"High voltage AC breaker",JB/T3855-1996"3.6-40.5KV voltage AC vacuum circuit breaker"and"vacuum circuit breaker" of IEC 62271-100:2001. Normal use condition a.The ambient temperature is between 40oC and -15oC;daily average temperature isn't over 35oC b.The average value of daily relative humidity isn't exceed 95%;average value of daily vapor pressure isn't exceed 2.2 kPa;average value of monthly relative humidity isn't exceed 90%;average value of monthly vapor pressure isn't over 1.8kPa; c.Altitude isn't over than 1000m. d.The ambient air is free from any pollution from dust,smoke,corrosive of flammable gas,vapor; e.The vibration or quake can be neglected from outside of the switchgear and control equipment. f.The magnetic interference inducted in the secondary system should be not over 1.6KV. Structure of Products and Working Principle 1.Structure ZN85A-40.5(3AV7)indoor high voltage AC vacuum circuit breaker is of upper and lower layer structure to effectively reduce the depth of breaker. The breaker adopts the compound insulation structure to meet the air gap and creepage requirement under normal operating condition,and to effectively reduce the volume of the breaker.