Outdoor High-Voltage AC Vacuum Circuit Breaker
ZW20 pole-mounted vacuum circuit breaker (12kV) supports both manual and electrical operations, is capable of breaking and closing currents, and is suitable for power distribution systems and rural power grids.
Product Description
The ZW20 pole-mounted circuit breaker is an outdoor power distribution switchgear rated at 12kV, three-phase AC 50Hz. Featuring both manual and electrical operations, it is primarily designed to break and close load currents, overload currents, and short-circuit currents. This VCB is widely used in substations and industrial distribution systems, and is especially suitable for rural power grids and locations requiring frequent operations.
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Product Advantages
Flexible Installation
Flexible installation options support either pole-hanging or base-mounting.
Reliable Sealing Performance
Operating at zero gauge pressure, the SF6 system utilizes proven sealing technology to ensure reliable, leak-free performance.
Safe Operation
An explosion-proof device is installed on the top of the enclosure. Even in the event of an internal fault, no high-temperature gases or debris will leak out.
Outdoor High-Voltage 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 |
