The ZN63(VS1)-12 Series Indoor Fixed-Type High-Voltage Vacuum Circuit Breaker is designed for three-phase AC 50Hz systems with a rated voltage of 12kV. It is widely used in the control and protection of electrical facilities in industrial enterprises, power plants, and substations, especially in environments that require frequent operations. The breaker features an integrated design, allowing it to be used as a fixed unit or paired with a specialized drive mechanism to form a draw-out unit. Its main circuit uses a fully sealed column design, ensuring compact size, high reliability, and no maintenance. It is compatible with switchgear like KYN28A-12 (GZS) and XGN series fixed-type switchgear.
| Type | ZN63(VS1)-12 Series |
| Rated Voltage | 12KV |
| Operating Voltage | 12KV |
| Rated Current | 630A, 1250A, 1250A, 1600A, 2000A, 2500A, 3150A, 4000A |
| Rated Short-Circuit Breaking Current (Rated Thermal Stable Current-RMS) | 20/25kA, 31.5kA, 40kA |
| Rated Short-Circuit Making Current (Peak) | 50/63kA, 80kA, 100kA |
| 4s Rated Short-Circuit Withstand Current | 20/25kA, 31.5kA, 40kA |
| Operating Withstand Voltage (Before/After Rated Breaking) / 1min Power Frequency Withstand Voltage |
To Ground42 (Across Break48 )kV |
| ImpulseWithstand Voltage (Before/After Rated Breaking)/ Rated Lightning Impulse Withstand Voltage Peak |
To Ground75 (Across Break85) kV |
| Rated Thermal Stable Time | 4s |
| Rated Operating Sequence | Open-0.3s-Close/Open-180s-Close/Open |
| Mechanical Life | 20000Times |
| Rated Short-Circuit Breaking Current Interrupting Times | 50Times |
| Operating Mechanism Rated Closing Voltage (DC) | ACV, DCV, 110V, 220V |
| Contact Gap | 11±1mm |
| Over-Travel (Contact Spring Compression Length) | 3.5±0.5mm |
| Three-Phase Opening/Closing Bounce Time | ≤2ms |
| Contact Closing Bounce Time | ≤2ms |
| Average Opening Speed | 0.9~1.2m/s |
| Average Closing Speed | 0.5~0.8m/s |
| Opening Timeat Operating Voltage | ≤0.05s |
| Opening Timeat Low Operating Voltage | ≤0.08s |
| Closing Time | 0.1s |
| Main Circuit Resistanceper Phase | 630≤55μΩ, 1250≤50μΩ |
| Allowable Cumulative Wear Thicknessof Moving / Stationary Contacts | 3mm |
Ambient Temperature: Maximum +40℃; Minimum -30℃
Relative Humidity: Daily average ≤90%; Monthly average <95%
Altitude: Standard service conditions ≤1000m (plain type); Special service conditions ≤3000m (plateau type)
Wind Speed: ≤34m/s (corresponding to 700Pa on cylindrical surfaces)
Seismic Intensity: ≤8 magnitude (horizontal acceleration 0.25g, vertical acceleration 0.125g)
Air Pollution Level: Class IV; Minimum nominal creepage distance: 31mm/kV
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