VS1-12 Indoor Fixed High-Voltage Vacuum Circuit Breaker

VS1-12 Indoor Fixed High-Voltage Vacuum Circuit Breaker is a three-phase AC 50Hz unit for 24kV power systems, providing protection and control in grid and industrial applications. It is ideal for frequent load switching and multiple short-circuit interruptions. The VS1-12 Indoor Fixed High-Voltage Vacuum Circuit Breaker features an integrated operating mechanism, supporting both fixed installation and withdrawable configurations via a dedicated moving chassis. Designed for ambient temperatures from -15°C to +40°C and altitudes up to 1000m, it ensures high electrical endurance, mechanical reliability, and consistent performance under demanding conditions.

product details

Type Designation

1	Vacuum Circuit Breaker (VCB)
2	Design Number
3	Rated Voltage (kV)
4	Rated Current (A)
5	Rated Short-circuit Breaking Current (kA)

Normal use environment

◆Ambient air temperature: upper limit +40°C, lower limit -15°C;

◆Altitude: ≤1000m (if higher altitude is required, the rated insulation level shall be increased accordingly);

◆Seismic intensity: not exceeding 8 degrees;

◆Daily average relative humidity of air not more than 95%, monthly average not more than 90%;

◆Locations without fire, explosion hazard, severe pollution, chemical corrosion, and violent vibration.

product Display

VS1-12 Fixed High-Voltage Vacuum Circuit Breaker (2)

VS1-12 Fixed High-Voltage Vacuum Circuit Breaker (1)

Technical Parameters

No.	Item	Unit	Value
1	Rated Voltage	kV	24
2	Rated Short-Time Power-Frequency Withstand Voltage (1min)	kV	65/79(Phase-to-Phase, Phase-to-Earth / Across Isolating Distance)
3	Rated Lightning Impulse Withstand Voltage (Peak)	kV	125/145(Phase-to-Phase, Phase-to-Earth / Across Isolating Distance)
4	Rated Frequency	Hz	50
5	Rated Current	A	630 1250	630 1250 1600 2000 2500 3150		630 1250 1600 2000 2500 3150
6	Rated Short-Circuit Breaking Current	kA	20/25	31.5		40
7	Rated Short-Time Withstand Voltage	kV	20/25	35.5		40
8	Rated Short-Circuit Duration	S	4
9	Rated Peak Withstand Current	kA	50/63		80		100
10	Rated Short-Circuit Making Current	kA	50/63		80		100
11	Auxiliary Circuit Power-Frequency Withstand Voltage (1min)	V	200
12	Rated Single/Back-to-Back Capacitor Bank Breaking Current	A	630/400(40kA is 800/400)
13	Rated Capacitor Bank Inrush Making Current	kA	12.5(Frequency Not Exceeding 1000Hz)
14	Mechanical Life	time	20000
15	Rated Current Breaking Operations (Electrical Endurance)	time	20000
16	Rated Short-Circuit Current Breaking Operations	time	50(40kA≤30)
17	Permissible Cumulative Wear Thickness of Moving/Fixed Contacts	mm	3
18	Energy Storage Time	S	≤10
19	Contact Gap	mm	16±1
20	Over-Travel	mm	3.5±0.5
21	Contact Bounce Time During Closing	ms	≤2(40kA≤3)
22	Three-Phase Opening/Closing Non-Simultaneity	ms	≤2
23	Average Opening Speed (From Contact Separation to 8mm)	m/s	1.5±0.2
24	Average Closing Speed (From 8mm to Contact Closure)	m/s	0.8±0.2
25	Main Circuit Resistance	μΩ	≤50(630A)≤45(1250A) ≤35(1600-2000A)≤25(2500A以上)
26	Rated Operating Sequence		O-0.3s-CO-180s-CO