Outdoor Vacuum Circuit Breaker with Permanent Magnetic Mechanism, ZW32-12M

This outdoor vacuum circuit breaker is suited for three phase AC outdoor power distribution network systems with rated voltage of 12kV and frequency of 50Hz, capable of breaking and closing load current, overload current and short-circuit current. These outdoor vacuum circuit breakers are used to protect and control of electrical power in substations, industrial and mining enterprises, as well as cities and rural areas where frequent operations of electrical grid are required.

This vacuum circuit breaker is featured by small size, lightweight, condensation resistance and maintenance-free operation, it can perform well in harsh environmental conditions.

Permanent magnet mechanism is used as operation device to holding the position of circuit breaker. It adopts less mechanical parts and shorter drive chain to reduce potential mechanical failures, thus greatly improving the reliability and prolonging service life.

Environmental Conditions Ambient temperature: -40°C ~ 40°C; Relative humidity: daily average ≤ 95%, monthly average ≤ 90%; Altitude: lower than 2000 m; Wind pressure: ≤ 700Pa (equivalent to wind speed of 34m/s); Earthquake intensity: ≤ magnitude 8; Areas without risks of fire, explosion, pollution, chemical corrosion and severe vibration; Features Small size, simple structure, maintenance free and long mechanical lifespan up to 30000 times; Placed in epoxy resin, environmental friendly, resistant against ozone and UV-radiation, light in weight and robust in structure; Permanent magnet mechanism, less mechanical parts, maintenance-free operation; Utilizing vacuum arc extinguishing, high insulation level; When a fault occurs in control system, emergency opening action can be accomplished manually to breaking rated load current; Body shell is made of stainless steel or treated by spray coating, with good corrosion and weather resistance; The control has functions of remote controlling, remote measuring, remote signaling and remote regulating; Technical Parameters

Item	Unit	Parameters
Rated voltage	kV	12
Rated current	A	630, 1250
Rated frequency	Hz	50
Power frequency withstand voltage, dry	kV	42/48
Power frequency withstand voltage, wet		34
Lightning impulsewithstand voltage(peak)	kV	75/85
Rated short-circuit breaking current	kA	20	25
Rated short-circuit making current(peak)	kA	50	63
Rated peak withstand current	kA	50	63
Short-time withstand current(4S)	kA	20	25
Rated operating sequence		O-0.3s-CO-180s-CO
Mechanical endurance	Times	30000
Weight	kg	approx. 150