ZN63A(VS1)-12/24 fixed-type indoor high voltage vacuum circuit breaker

ZN63A(VS1)-12/24 Indoor High Voltage Vacuum Circuit Breaker (hereinafter referred to as the circuit breaker) is suitable for indoor switchgear in 12~24 kV power systems. As a protection and control unit for power grid equipment and industrial/mining enterprise power equipment, due to the special advantages of vacuum circuit breakers, it is particularly suitable for places requiring frequent operations at rated working current or multiple interruptions of short-circuit current.The circuit breaker adopts an integrated design of the operating mechanism and the circuit breaker body. It can be installed as a fixed unit or equipped with a special propulsion mechanism to form a handcart unit.

product details

Type Designation

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

Technical Parameters

No.	Item		Unit	Partmeter
1	Rated Voltage		kV	12		24
2	Rated Insulation Level	1min Power Frequency Withstand Voltage (r.m.s.)		42		65
3		Lightning Impulse Withstand Voltage (peak)		75		125
4	Rated Frequency		Hz	50/60
5	Rated Current		A	630,1250	630,1250,1600, 2000,2500,3150		1250,1600,2000, 2500,3150,4000*
6	Rated Short-Circuit Breaking Current		kA	20/25	31.5		40
7	Rated Short-Time Withstand Current			20/25	31.5		40
8	Rated Short-Duration Power Frequency Withstand Voltage		S	4
9	Rated Peak Withstand Current		kA	50/63	80		100
10	Rated Short-Circuit Making Current			50/63	80		100
11	Rated Capacitor Bank Breaking Current		A	630
12	Rated Short-Circuit Breaking Current Breaking Times		time	30(Class E2)
13	Mechanical Life			≥20000(Class M2)
14	Contact Gap		mm	9±1		13±1
15	Contact Travel			3.5±0.5		4±1
16	Average Closing Speed		m/s	0.6±0.2		0.8±0.2
17	Average Opening Speed			1.1±0.2		1.3±0.2
18	Opening Time (at rated voltage)		ms	≤40		≤50
19	Closing Time (at rated voltage)			≤60		≤75
20	Contact Closing Bounce Time			≤2
21	Three-Phase Closing Non-Simultaneity			≤2
22	Allowable Cumulative Wear Thickness of Moving and Fixed Contacts		mm	3
23	Main Circuit Resistance		μΩ	≤60(630A)	≤50(1250A)		≤35(1600～4000A)
24	Rated Operating Sequence			O-0.3s-CO-180s-CO;O-180s-CO-180s-CO(40kA)
Note: Forced air cooling is required for 4000A and above.

product Display

VS1-24 Indoor High-Voltage Load Breaker Switch

VS1-24 Indoor High-Voltage Load Breaker Switch-2

Outline and Installation Dimension

1.Drawing of Overall Dimensions for ZN63A(VS1)-12 Fixed Type (Phase Distance 150mm) Circuit Breaker

Rated Current (A)	630	1250
Rated Short-Circuit Breaking Current (kA)	20,25,31.5	25,31.5
Phase Distance (mm)	150±1.5
Mechanism Top Interlock L1 (mm)	45 (Interlock extends left or right; length can be customized as required)
Mechanism Main Shaft Interlock L2 (mm)	45 (Interlock extends left or right; length can be customized as required)

2.Drawing of Overall Dimensions for ZN63A(VS1)-12 Fixed 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
Phase Distance (mm)	210±1.5
Mechanism Top Interlock L1 (mm)	45 (Interlock extends left or right; length can be customized as required)
Mechanism Main Shaft Interlock L2 (mm)	45 (Interlock extends left or right; length can be customized as required)

3.Drawing of Overall Dimensions for ZN63A(VS1)-12 Fixed Type (Phase Distance 275mm) Circuit Breaker

Rated Current (A)	1600,2000,2500,3150
Rated Short-Circuit Breaking Current (kA)	31.5,40
Phase Distance (mm)	275±1.5
Mechanism Top Interlock L1 (mm)	45 (Interlock extends left or right; length can be customized as required)
Mechanism Main Shaft Interlock L2 (mm)	45 (Interlock extends left or right; length can be customized as required)

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
Phase Distance (mm)	275±1.5
Mechanism Top Interlock L1 (mm)	45 (Interlock extends left or right; length can be customized as required)
Mechanism Main Shaft Interlock L2 (mm)	45 (Interlock extends left or right; length can be customized as required)

Rated Current (A)	1600,2000,2500,3150	4000
Rated Short-Circuit Breaking Current (kA)	31.5,40	40
Phase Distance (mm)	275±1.5
Mechanism Top Interlock L1 (mm)	45 (Interlock extends left or right; length can be customized as required)
Mechanism Main Shaft Interlock L2 (mm)	45 (Interlock extends left or right; length can be customized as required)

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.