ZN28A-12 series Indood Vacuum Circuit Breaker

Item Name: ZN28A-12 series Indood Vacuum Circuit Breaker

As indoor AC hignvoltage switchgear of rated voltage of 12KV and three -phase 50Hz, the ZN28A-12 Series indoor AC high voltage vacuum circuit breaker mainly serves in the fixed type switchgear or removable switchgear for replacing the oil-minimum circuit-breaker inside backward switchgear. The circuit-breaker can function ad protection and control device for electic equipment in mineral& industrial enterprise, power plant and substation and the occasions featuring frequent operation.

Standard: GB1984, jb3885, DL/T403.

Item		Unit	Data
			20kA	25kA	31.5kA	40kA
Rated Voltage		kV	12
Rated Current		A	630, 1250	630, 1250, 1600	1250, 1600, 2000	2000, 2500, 3150
Rated short-circuit breaking current		kA	20	25	31.5	40
Rated short-circuit making current(peak)		kA	50	63	80	100
Rated peak withstand current		kA	50	63	80	100
4S Rated short-time withstand current		kV	20	25	31.5	40
Rated insulating level	power frequency withstand voltage(rated open circuit before and later)	kV	42
	Impulse withstand voltage(rated open circuit before and later)	kV	75
Rated operating order			O-0.3S-CO-180S-CO		O-180S-CO-180S-CO
Mechanical life		time	10000
Breaking times of rated short-circuit breaking current		time	30			20
Contact opening size		mm	11±1
Overtravel		mm	4±1
Different period of three-phase switch on and off		ms	≤2
Spring jumping time of contact switch on		ms	≤2
Average switch-off speed		m/s	1.2±0.3
Average switch-on speed		m/s	0.6±0.2
Switch-off time	Max operating voltage	s	≤0.06
	Min operating voltage	s	≤0.08
Switch-on time		s	≤0.2
Resistance of each phase main loop		μΩ	≤50