Insulating medium ZW20 12kv outdoor intelligent high voltage vacuum circuit breaker
 
 1.Detail descroption
 
General description:
ZW20 series circuit breaker is a new product which is inventively produced  As a kind of maintenance-free outdoor vacuum switch, it has the features of three-phase non-segregated longitudinal magnetic field vacuum quenching of arc, SF6 as the insulation and the insulation of silicone rubber/solid epoxy resin.
ZW20 series circuit breaker use three-phase non-segregated structure and has the features of stable and reliable breaking performance, no combustion and explosion danger, maintenance-free, light weight (two-thirds of similar products ), high cycle life (mechanical operating life is 10000 times) and so on. New designed spring operating mechanism is exposed in SF6 to effectively avoid traditional spring operation mechanism's design defects, such as stagnation and rustiness, making a significant improvement in reliability.
 
Main purpose:
ZW20 series circuit breaker is mainly used to break and close load current, overload current and short-circuit current in the electric power system. It is used to protect and control the power distribution system in transformer substation, industrial and mining enterprises, and it is especially suitable for the transformation of the power network in rural and city. This circuit breaker can be used with FTU/dividing switch controller, so as to automatically detect, isolate and alarm the faults in main line's section and branch, and monitor line operation. And it has the function of automatically recovering power supply in the fault segment. After adding measure and protection, control and communication functional module to the switch, it can satisfy the requirement of power distributing automation.
 
1 casted by Epoxy resin and silicone rubber. 
2. Good tightness, moistureproof.anti-condesation 
3.suitble for hot and humid place
 
2.Main Tech-Parameter
 
 

1	rated voltage	kv	12-24
2	rated current	A	630/1000
3	rated impulse withstand voltage(peak)	kv	75/85
4	power frequency withstand voltage	kv	42/48
5	rated short-circuit breaking current	KA	16/20/25
6	rated peak withstand current	KA	40/50/63
7	rated short circuit breaking current breaking times	times	30
8	rated short-circuit duration of external	s	4
9	external creep age distance	cm/kv	3.8
10	rated operating voltage and auxiliary circuits rated voltage	v	AC DC 220
11	closing time	ms	≤45
12	opening time	ms	≤45
13	white center distance	mm	135±1.5
14	external charged air insulation distance	mm	240±2
15	mechanical life	times	20000
16	net weight	kg	140