ZW20-12 Outdoor Vacuum Circuit Breaker

Selection

Operating conditions

1. Altitude≤2000 meters 2. The environment temperature: -30℃ ~+55℃ outdoor; the highest annual average temperature 20 ℃, the highest daily average temperature 30 ℃; 3. Relative humidity: 95% (25℃) 4. Seismic capacity: horizontal ground acceleration 0.3g, vertical ground acceleration 0.15g, at the same time duration of three sine waves, a safety factor of 1.67 5. Earthquake intensity: 7 degrees 6. The maximum daily temperature difference: 25 ℃ 7. The intensity of sunshine (wind speed 0.5m/s): 0.1W/cm² 8. The maximum wind speed: 34m/s 9. The maximum ice thickness: 10mm 10.Installation position: outdoor, the 10kV overheadline responsibility demarcation point 11.Grounding: neutral non grounding, arc suppression coil grounding and low resistance grounding.

Technical data

Item			Unit	Parameter
Voltage, current parameters
Rated voltage			KV	12
Insulation level of fracture	The power frequency (dry and wet test)		KV	48
	Lightning impulse  test voltage (peak)		KV	85
On the ground and interphase insulation level	Power frequency	Dry test	KV	42
		Wet test	KV	34
	Lightning impulse test voltage (peak)		KV	75
Rated current			A	630
Rated short-circuit breaking current			kA	16, 20, 25
Rated short-circuit breaking current interruption times			Times	30
Rated short-time withstand current			kA	16, 20, 25
Rated short circuit duration			S	4
Rated short-circuit close current (peak)			kA	40, 50, 63
Rated peak withstand current			kA	40, 50, 63
Mechanical life			Times	> 10000
Rated current on and off times			Times	10000
Net weight			kg	180
Mechanical properties
Clearance between open contacts			mm	9	+1
					-0.5
Contact overtravel			mm	3	+1
					-0.5
Opening speed			m/s	1.2±0.2
Closing speed			m/s	0.6±0.2
Contact closing jump time			ms	≤2
pjase spacing			mm	280±2
External charged air insulation distance			mm	235±2
External creepage distance			cm/kV	3.8
Three phase opening different period			ms	≤2
Each phase conductive loop resistance			μΩ	≤150
Closing time			ms	20~60
Opening time			ms	18~45
The energy storage motor rated power			W	≯40
The energy storage motor rated voltage			V	AC220
Rated closing operating voltage			V	AC220
Maximum / minimum closing operating voltage			V	AC264/143
Rated opening operation voltage			V	AC220
Maximum / minimum voltage of motor			V	AC264/143
Maximum / minimum opening operating voltage			V	AC242/187
Ratecl pressure SF6 gas (gauge)			MPa	"0"

Overall and mounting dimensions(mm)