XNZN63(VS1)-12 Indoor High Voltage Vacuum Circuit Breaker

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XNZN63(VS1)-12 indoor high voltage vacuum circuit breaker is used for 12kV electrical power system, working as the protection and control unit of power grid equipment and industrial and mining enterprises’ power equipment. It is especially applicable for occasions that demand frequent operations of rated working current or repeated breaks of short circuit current.

The operating mechanism and the body of the breaker adopts the one-piece design. Therefore, this series of circuit breaker can be fixed as an independent unit, or installed with a handcart.

Product introduction

Working Conditions:
1. Normal conditions
a) Ambient temperature
Highest temperature: +40℃
Lowest temperature: -15℃
b) Humidity
Average daily relative humidity: ≤ 95%
Average monthly relative humidity: ≤ 90%
Average daily vapour pressure: ≤ 2.2 x MPa
Average monthly vapour pressure: ≤ 1.8 x MPa
c) Altitude: not higher than 1500m
d) Earthquake intensity: not higher than 8°
e) Working site: no water dropping, no fire or explosion potential, no chemical or corrosive gas, no severe vibration
2. Special conditions:
This series of circuit breaker can also be used in other different conditions, after consistent agreement between client and manufacturer.

Technical parameters:

No.	Items				Units	Values
1	Rated Voltage				kV	12
2	Rated Insulation Level	1min Power Frequency Withstand Voltage			kV	42/48
		Rated Lightning Impulse Withstand Voltage			kV	75/85
3	Rated Operation Sequence					0-t-co-t1-co*
Model	Rated Current	Rated Breaking Current (kA)	Rated Short Circuit Making Current (kA)	Rated Short Circuit Duration Time (s)		Number of Times of Breaking	Mechanical Life
VS1-12/M	630, 1250	20/20	50/63	4		100	40000
	1250, 1600, 2000, 2500	31.5	80	4		50	40000
	1600, 2000, 2500, 3150	40	100	4		30	40000

Mechanical parameters:

No.	Items	Units	Values
1	Clearance Between Open Contacts	mm	11±1
2	Contacting Travel	mm	3.5±1
3	Three Phases Simultaneity While Opening	ms	≤2
4	Contact Bounce Time While Closing	ms	≤2
5	Contacting Pressure of Contacts While Closing	N	20kA	25kA	31.5kA	40kA
5	Contacting Pressure of Contacts While Closing	N	2000±200	2400±200	3100±200	4750±250
6	Average Opening Speed	m/s	1.0 - 1.4
7	Average Closing Speed	m/s	0.6 - 0.9
8	Opening Time	ms	≤60
9	Closing Time	ms	≤100
10	Arcing Time	ms	≤15
11	Breaking Time	ms	≤65
12	Accumulated Erosion Thickness Limit of Moving and Fixed Contacts	mm	3

Technical parameters of permanent-magnet operating mechanism:

No.	Items	Units	Values
1	Travel of Movable Iron Core	Mm	35
2	Control Current While Closing	A	1A
3	Opening Current	A	2.6A
4	Rated Operation Voltage	V	DC220V