Features

The VJY1 indoor AC vacuum circuit breaker, the nylon enclosed column is adapted in the arc chute. Comparing with traditional air insulated column, the breaker has following advantages: 

1. the technical performance of solid insulation embedded column is higher than GB/DL Standards.

2. Easy structure design, less dismountable components, highly reliable.

3. Advanced and energy-saving manufacture technologies have been adapted, light and eco-friendly material.

4. New generation insulating material has been adapted; Extremely high insulation ability.

5. Extremely high mechanical strength, the longitudinal pulling force can reach to 10000N. 

6. Adapting the latest and newest automation molding technology (APG Molding Technology), which is highly stable and reliable.

7. Safe and Reliable, maintenance-free.

Mechanical Features

1. The storage transmission of VJY1 is gear transmission; and the release device is swing-type leverage. The common structure of VS1 is very loose. The release device move radially, which requires higher accuracy, otherwise, there are some possibilities of stuck, open failure and early release.   

2. Due to the overall modular layout, the common vacuum breaker adapted Four-link Structure. The closing energy is transmitted to the spindle arm through four-link structure. There are many components of four-link transmission, especially the two pieces of vertical boards. There are accuracy errors existing in components processing and assembling, therefore, some components must be broken after a period of mechanical endurance. The more the components are, the more the hidden dangers are. The VJY1 is with tight structure, which is highly reliable.

3. According to the tests making by our company, the mechanical endurance of VJY1 can be more than 20000 or 30000 times, which is more than VS1’s.

Main Specifications and Technical Parameters
No.	Item		Unit	Value
1	Rated voltage		kV	12
2	Rated insulation level	Rated lightning impulse voltage withstand peak	kV	75
		Power frequency voltage withstand (1min)	kV	42
3	Rated short circuit breaking current		kA	20	25	31.5	40
4	Rated current		A	630           1250		630 1250	1250 1600
						1600 2000	2000 2500
						2500 3150	3150 4000
5	Rated thermal current (Valid values)		kA	20	25	31.5	40
6	Rated dynamic current (Peak value)		kA	63		80	100
7	Rated short-circuit current (Peak value)		kA	50	63	80	100
8	Breaking times of rated short circuit breaking current		Times	50
9	Secondary circuit power frequency voltage withstand (1min)		V	2000
10	Rated operating sequence			O-0.3s-CO-180s-CO
				O-180s-CO-180s-CO
11	Rated thermal stabilization time		s	4
12	Rated single / back to back capacitor bank breaking current		A	630/400 800/400（40kA）
13	Mechanical life		Times	10000

Mechanical Characteristic Parameters after Adjust and Assembly of Circuit Breaker

no.	Item	Unit	Value
1	Contact opening distance	mm	9±1
2	Contact stroke		3.5±0.5
3	Average closing speed (6mm ～ Contact closure)	m/s	0.8±0.2
4	Average opening speed (Contact closure ～ 6mm )		1.1±0.2
5	Closing time (Rated voltage)	ms	30-70
6	Opening time (Rated voltage)		20-50
7	Contact closing bounce time	ms	≤2	≤3（40kA）
8	Different period of three-phase opening		≤2
9	Allowed cumulative wear thickness of dynamic and static contact	mm	3
10	Electrical loop resistance	mW	≤50（630A）≤45（1250A）
			≤35（1600～2000A）≤25（higher than 2500A）
11	Contact pressure of closing contacts	N	2000±200（20kA）2400±200（25kA）
			3100±200（31.5kA） 4500±250（40kA）