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ZN28A-12 indoor HV AC vacuum circuit breaker

   General

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ZN28A-12 indoor HV AC vacuum circuit breaker, is with spring or electromagnetic operating mechanism. The main circuit breaker applies the gas insulation structure. Circuit breaker is central handcart type and fixed type which are separately fixed on withdrawout or fixed type Switchgear.

 

 

   Technical parameters

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Item		Unit
Rated voltage		KV	12
Rated frequency		HZ	50/60
Rated insulation	1min power frequency withstand voltage	42	42
	Lightning impulse withstand voltage	75	75
Rated current		A	630、1250、1600、2000、2500、3150
Rated short circuit drop-out current		KA	20	25	31.5	40	50
Rated short circuit making current		KA	50	63	80	100	130
Rated short time withstand current (4S)		KA	20	25	31.5	40	50
Rated withstand current (peak)		KA	50	63	80	100	130
Rated heterogeneous phase grounding fault drop-out current		KA	17.4	21.8	27.4	34.8	43.5
Rated single capacitor bank drop-out current		A	630
Rated back to back capacitor bank drop-out current		A	400
Rated short circuit drop-out         current and numbers		numbers	20~31.5KA;50;40KA;30;50、63KA;20
Mechanical endurance		numbers	100000
Rated operation sequence			20~40KA;O-0.3S-CO-180S-CO 50KA;O-180S-CO-180S-CO

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