Outdoor high-voltage AC intelligent vacuum circuit breaker
The ZW68 pole-mounted circuit breaker (12kV) supports manual/electric operation, can open and close currents, and is suitable for distribution systems and rural power grids.
Product Description
The ZW68 pole-mounted circuit breaker is a new outdoor switching device jointly designed by our company and the China Electric Power Research Institute. It is used for the control and protection of three-phase AC 50Hz, rated voltage 12kV distribution overhead lines. While meeting conventional user requirements, it is also suitable for frequent operation and harsh environmental conditions.
Product Advantages
Single-Phase Post
Single-phase independent post-type structure design.
Breakdown Voltage at Open Gap
At rated contact gap, the internal insulation of the open gap withstands 48kV power frequency voltage for 1 minute.
Direct-Acting Module
Direct-acting modular design.
Flexible Combination
Arranged horizontally and vertically with the embedded-pole vacuum circuit breaker, flexible modular installation.
Maintenance-Free Inside Enclosure
Fully enclosed in a housing, long mechanical life, maintenance-free.
Outdoor high-voltage AC intelligent vacuum circuit breaker
ZW68-12
Technical Specifications
| Model | ZW68-12/T630-20 | |
| Operation Mode | Manual/Motorized | |
| Rated Voltage | 12 kV | |
| Rated Frequency | 50 Hz | |
| Rated Current | 630 A | |
| Rated Short-Circuit Breaking Current | 20 kA | |
| Rated Peak Withstand Current (Peak) | 50 kA | |
| Rated Short-Time Withstand Current (4s) | 20 kA | |
| Rated Short-Circuit Making Current (Peak) | 50 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 |
| Across Open Contact | 48 kV | |
| Secondary Circuit Withstand Voltage | 2 kV | |
| Lightning Impulse Withstand Voltage (Peak) | Phase-to-Phase, Phase-to-Ground | 75 kV |
| Across Open Contact | 85 kV | |
| Mechanical Life | Circuit Breaker | 10000 cycles |
| Disconnect Switch (Manual) | 3000 cycles |
Mechanical characteristic parameters
| Name | Unit | Parameter | |
| Contact gap S | mm | 9 ± 1 | |
| Contact overtravel L1 | mm | 3 ± 0.5 | |
| Opening speed (6 mm after contact separation) | m/s | 1.2 ± 0.2 | |
| Closing speed (6 mm before contact touch) | m/s | 0.8 ± 0.2 | |
| Opening time | ms | 20 ~ 45 | |
| Closing time | ms | 30 ~ 60 | |
| Three-phase closing/opening non-simultaneity | ms | ≤ 2 | |
| Contact closing bounce time | ms | ≤ 2 | |
| Opening rebound amplitude L2 | mm | ≤ 1.5 |
Mechanical characteristic parameters of the disconnector
| Unit | Parameter | |
| Contact gap S | mm | 80 ± 2 |
| Contact overtravel | mm | 31 ± 2 |
| Three-phase closing/opening non-simultaneity | mm | ≤ 3 |
| Disconnector operating force | N | ≤ 250 |
Operating mechanism parameters
| Name | Rated Voltage (Ur) | Operating Voltage | Rated Power (P) |
| Charging motor | DC/AC110, DC/AC220V | 85%～110% Ur | 40W |
| Closing coil | DC/AC110, DC/AC220V | 85%～110% Ur | 440W |
| Opening coil | DC/AC110, DC/AC220V | 65%～110% Ur | 440W |
| Charging time | ≤ 15s |
