ZW32-12 Series outdoor high voltage vacuum circuit breaker is rated voltage 12kV, three phase AC 50Hz outdoor distribution equipment .mainly used to breaking closing power system load current ,overload current and short-circuit current. Applicable to substations and power distribution in industrial and mining enterprises for protection and control purposes, and frequent operation place for rural power .

The circuit breaker Small size, light weight, anti-condensation, maintenance and so on. Adapt to adverse weather conditions, and to teach filthy environment.

2. Service environment
a) Air temperature: Maximum temperature: +85℃; Minimum temperature:-45℃

b) Humidity: Monthly average humidity 95%; Daily average humidity 90% .

c) Altitude above sea level: Maximum installation altitude:2500mor more higher.

d) Ambient air not apparently polluted by corrosive and flammable gas, vapor etc.

e) No frequent violent shake

3. Mainly Technical parameters

No.	Item	Unit	Parameters
1	rated voltage	kV	12
2	rated frequency	Hz	50
3	rated current	A	630/1250
4	rated short-circuit breaking current	kA	20/25
5	rated peak value withstand current(peak)	kA	50/63
6	rated short time withstand current	kA	20/25
7	rated short-circuit closing current (peak)	kA	50/63
8	mechanical life	Times	10000
9	rated short-circuit breaking current breaking number	Times	30
10	power frequency withstand voltages(wet) (dry) inter-phase ,earth, fracture	kV	42/48
11	Lightning impulse withstand voltage (peak) inter-phase ,earth, fracture	kV	75/85
12	Secondary circuit 1min power frequency voltages	kV	2