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China ZN63A(VS1)-12/24 Indoor High Voltage Vacuum Circuit Breaker - Reliable Suppliers & Factory Solutions
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 | Parameter | ||||
| 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
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.
Frequently Asked Questions (FAQ)
What is the ZN63A(VS1) vacuum circuit breaker and where is it used?
The ZN63A(VS1) is an indoor vacuum circuit breaker designed for rated voltages of 12kV and 24kV. It is widely used in power distribution systems for industrial facilities, utilities, and commercial buildings where reliable medium-voltage switching and short-circuit protection are required.
What rated voltages and currents are available for the VS1 circuit breaker?
The VS1 circuit breaker is available in 12kV and 24kV rated voltages. Rated currents range from 630A up to 4000A depending on the model. Short-circuit breaking current ratings include 20kA, 25kA, 31.5kA, and 40kA to suit various application demands.
How does the vacuum arc extinguishing principle work in the VS1 breaker?
The VS1 uses a high-vacuum interrupter. When the contacts separate, an arc forms between them. A specially designed axial magnetic field distributes the arc uniformly across the contact surface at a low arc voltage. When the current passes through zero, residual charged particles rapidly recombine or condense on internal surfaces, restoring dielectric strength and extinguishing the arc.
What is the mechanical life and electrical endurance of the VS1 circuit breaker?
The VS1 offers a mechanical life of ≥20,000 operations (Class M2) and an electrical endurance of 30 short-circuit breaking operations (Class E2). This ensures long service life and reduced maintenance requirements in demanding applications.
What phase distances are available for the VS1 fixed-type circuit breaker?
The VS1 fixed-type circuit breaker is available with phase distances of 150mm, 210mm, and 275mm to accommodate different switchgear cabinet configurations. The interlock length (L1 and L2) of 45mm can also be customized to extend left or right as required by the installation.
Is special cooling required for high-current versions of the VS1 breaker?
Yes. For the VS1 circuit breaker with a rated current of 4000A and above, forced air cooling is required to ensure safe and stable long-term operation. Standard configurations up to 3150A operate without additional cooling measures under normal indoor conditions.