Outdoor HV AC Vacuum Circuit Breaker
ZW20 pole-mounted circuit breaker (12kV), supports manual/electric operation, capable of making and breaking currents, suitable for distribution systems and rural power grids.
Product Description
The ZW20 pole-mounted circuit breaker is an outdoor distribution switchgear rated at 12kV, 50Hz three-phase AC. It features both manual and electric operation modes and is primarily used for making and breaking load currents, overload currents, and short-circuit currents in power systems. It is widely applied in substations, industrial and mining distribution systems, and is especially suitable for rural power grids and frequent operation locations.
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Product Advantages
Flexible Installation Methods
Flexible installation via pole-mounted hoisting or base-mounted methods.
Reliable Sealing Performance
SF6 pressure at zero gauge pressure, with mature sealing structure technology, ensuring reliable sealing and minimal leakage.
Safe Operation
An explosion-proof device is installed on top of the enclosure, preventing the release of high-temperature gas or debris even in the event of internal faults.
Outdoor HV AC Vacuum Circuit Breaker
（ZW20 Spring / Permanent Magnet Type）
ZW20 Model Basic Parameters
| Parameter Item | Parameter Value |
| Model | ZW20 |
| Operation Method | Manual/Motorized |
| Rated Voltage | 12 kV |
| Rated Frequency | 50 Hz |
| Rated Current | 630 A |
| Rated Short-Circuit Breaking Current | 20, 25 kA |
| Rated Peak Withstand Current (Peak) | 50, 63 kA |
| Rated Short-Time Withstand Current (4s) | 20, 25 kA |
| Rated Short-Circuit Making Current (Peak) | 50, 63 kA |
| Rated Current Breaking Cycles | 10000 cycles |
| Rated Short-Circuit Breaking Cycles | 30 cycles |
| 1-Minute Power-Frequency Withstand Voltage (Phase-to-Phase, Phase-to-Ground) | 42 kV |
| 1-Minute Power-Frequency Withstand Voltage (Across Open Contact) | 48 kV |
| 1-Minute Power-Frequency Withstand Voltage (Secondary Circuit) | 2 kV |
| Lightning Impulse Withstand Voltage (Peak, Phase-to-Phase, Phase-to-Ground) | 75 kV |
| Lightning Impulse Withstand Voltage (Peak, Across Open Contact) | 85 kV |
| Mechanical Life | 10000 cycles |
Mechanical Characteristics
| Parameter | Unit | Data |
| Contact Gap | mm | 9 ± 1 |
| Contact Over-travel | mm | 3⁺¹₋₀.₅ |
| Average Opening Speed | m/s | 1.1 ± 0.2 |
| Average Closing Speed | m/s | 0.6 ± 0.2 |
| Contact Bounce Time | ms | ≤ 2 |
| External Phase-to-Phase Center Distance | mm | 275 ± 1 |
| Three-Phase Opening/Closing Non-Simultaneity | ms | ≤ 2 |
| Main Circuit Resistance per Phase | μΩ | ≤ 140 |
| Closing Time | ms | 20 ~ 60 |
| Opening Time | ms | 20 ~ 45 |
| Rated SF₆ Gas Pressure (Gauge) | MPa | “0” |
| External Live Air Insulation Distance | mm | 240 ± 2 |
Operating Power Supply and Motor Parameters
| Parameter | Unit | Data (AC220) | Data (DC220) | Data (DC24) |
| Charging Motor Voltage | V | AC220 | DC220 | DC24 |
| Rated Power of Charging Motor | W | ≯40 | ≯40 | ≯40 |
| Closing Operating Voltage | V | AC220 | DC220 | DC24 |
| Opening Operating Voltage | V | AC220 | DC220 | DC24 |
