ZN33B-12 Suspended High Voltage Vacuum Circuit BreakerDetailed product description：

ZN33B-12 suspension type high-voltage vacuum circuit breaker (hereinafter referred to as the circuit breaker) is a highly reliable and maintenance free product of new design, which absorbs the technical essence of VD4, VK and VS1 products at home and abroad on the basis of the original ZN33B-12 product. Circuit breakers are suitable for indoor high-voltage distribution equipment with three-phase AC 50HZ and rated voltage of 12kV and below. As a protection and control unit for power grid equipment and industrial and mining enterprise power equipment, the circuit breaker has excellent performance due to the patented CDY type permanent magnet mechanism attached to it. It is particularly suitable for places with frequent operation or multiple short-circuit current interruptions.

Technical parameters of ZN33B-12 suspended high-voltage vacuum circuit breaker

serial number S．N	project Item	unit Unit	numerical value Digital Value
one	rated voltage Rated Voltage	kV	twelve
two	Rated short-time power frequency withstand voltage (1min) Rated Short Period Work Frequency Voltage Endurance (1 min)		forty-two
three	Rated lightning impulse withstand voltage (peak) Rated Thunder and Lightening Striking Endurance Voltage (Peak Value)		seventy-five
four	rated frequency Rated Frequency	HZ	fifty
five	rated current Rated Current	A	630 1250	630 1250
six	Rated short-circuit breaking current Rated Short-circuit On and Off Current	KA	twenty	thirty-one point five
seven	Rated short-time withstand current Rated Short Period Endurance Current		twenty	thirty-one point five
eight	Rated short-circuit duration Rated Short-circuit Continuing Time	S	four
nine	Rated peak withstand current Rated Peak Value Endurance Current	kA	fifty	eighty
ten	Rated short-circuit closing current Rated Short-circuit On-switch Current		fifty	eighty
eleven	Secondary circuit power frequency withstand voltage (1min) Secondary Loop Work Frequency Voltage Endurance (1 minute)	V	two thousand
twelve	Rated Single/Back to Back Capacitor Group On and Off Current	A	630/400
thirteen	Rated capacitor bank closing inrush current Rated Capacitor Group Enclosed Surge	KA	12.5 (Frequency not larger than 1000Hz)
fourteen	mechanical life Mechanical Lifespan	time Times	twenty thousand
fifteen	Rated current breaking times Rated Current On and Off Times		twenty thousand
sixteen	Rated short-circuit current breaking times Rated Short-circuit Current On and Off Times		fifty
seventeen	Allowable cumulative thickness of wear for dynamic and static contacts Allowed Worm Accumulated Thickness of Dynamite and Static Contact Head	mm	three
eighteen	Rated operating sequence Rated Operating Sequence		OFF minute -0.3S-ON/OFF combined minute -180S-ON/OFF