VS1-12/24 withdrawable indoor high voltage vacuum circuit breaker

VS1-12/24 Indoor Withdrawable 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.

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

product Display

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

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

Outline and Installation Dimension

1.Drawing of Overall Dimensions for VS1-12 withdrawable Type (Phase Distance 150mm) Circuit Breaker

Rated Current (A)	630	1250
Rated Short-Circuit Breaking Current (kA)	20,25,31.5	25,31.5
Matching Fixed Contact Size (mm)	Φ35	Φ49
Phase Distance (mm)	150±1.5

2.Drawing of Overall Dimensions for VS1-12 withdrawable Type (Phase Distance 210mm) Circuit Breaker

Rated Current (A)	630	1250	1600
Rated Short-Circuit Breaking Current (kA)	20,25,31.5	25,31.5,40	31.5
Matching Fixed Contact Size (mm)	Φ35	Φ49	Φ55
Phase Distance (mm)	210±1.5

3.Drawing of Overall Dimensions for VS1-12 withdrawable Type (Phase Distance 275mm) Circuit Breaker

Rated Current (A)	1600,2000	2500,3150
Rated Short-Circuit Breaking Current (kA)	31.5,40	31.5,40
Matching Fixed Contact Size (mm)	Φ79	Φ109
Phase Distance (mm)	275±1.5

4.Drawing of Overall Dimensions for ZN63A(VS1)-24 Fixed Type Circuit Breaker

Rated Current (A)	630	1250	1600
Rated Short-Circuit Breaking Current (kA)	20,25,31.5	25,31.5,40	31.5
Matching Fixed Contact Size (mm)	Φ35	Φ49	Φ55
Phase Distance (mm)	275±1.5

Rated Current (A)	1600,2000	2500,3150	4000
Rated Short-Circuit Breaking Current (kA)	31.5,40	31.5,40	40
Matching Fixed Contact Size (mm)	Φ79	Φ109
Phase Distance (mm)	275±1.5

Arc Extinguishing Principle

The ZN63A(VS1)-12/24 series circuit breaker utilizes a vacuum interrupter with a high degree of vacuum. During normal opening or short-circuit interruption, the moving contact is driven by the operating mechanism, causing it to separate from the fixed contact and generate an arc between them. Due to the special design of the moving and fixed contacts, an axial magnetic field is generated between them. This field controls the arc, causing it to burn uniformly and move across the contact surface while maintaining a low arc voltage. When the arc current naturally passes through zero, the remaining ions, electrons, and metal vapor, under the influence of the electromagnetic field, quickly recombine or condense on the contact surfaces and the shield. The dielectric strength across the interrupter gap is rapidly restored, thereby extinguishing the arc and achieving the purpose of interruption.