ZW8-12,ZW8-12G Hv Vacuum Circuit Breaker
ZW8-12G series vacuum circuit breaker is the outdoor three-phase AC high voltageswitchgear of rated voltage 12KV and 50Hz, to make and break the load currentoverload current , short current of urban and rural power grid and miniature power system.The product is designed into three-phase common box type, with the three-phasevacuum arc-extinguishing chamber in the metallic box,employs SMC insulation materialto get strong phase-to-phase/to-phase insulation, with the reliable performance and high insulation strength.
ZW8-12G circuit breaker is combined with ZW8-12 circuit breaker and isolatingswitch, called combined circuit breaker, served as segment switch. lts operatingmechanism is CT23 type spring energy-storage operating mechanism that is divided intoelectric type and manual type.
Specification Parameter
| Item | Unit | Parameter | ||||
| 6.3kA | 12.5kA 20kA | |||||
| Rated voltage | kV | 12 | ||||
| Rated current | A | 630 | ||||
| Rated short-circuit breaking current | kA | 6.3 | 12.5 | 20 | ||
| Rated short-circuit making current(peak) | kA | 16 | 31.5 | 50 | ||
| Rated peak withstand current | kA | 16 | 31.5 | 50 | ||
| Rated short-time withstand current | kA | 6.3 | 12.5 | 20 | ||
| Rated insulation leve | 1min line frequency withstand voltag(dry type) | kV | 42 | |||
| Thunder impulse withstand voltage(peak) | 75 | |||||
| Rated operating sequence | O-0.3s-CO-180s-CO | |||||
| Mechanical life | times | 10000 | ||||
| Rated short-circuit breaking current breaking times | times | 30 | ||||
| Rated closing voltage of operating mechanism | V | 110,220 | ||||
| Rated opening voltage of operating mechanism | V | 110,220 | ||||
| Clearance between open contacts | mm | 111 | ||||
| Over stroke(compression length of contact spring) | mm | 3+1.0 +0.3 | ||||
| Three-phase opening and closing asynchrony | ms | ≤2 | ||||
| Closing bouncing time of contacts | ms | ≤2 | ||||
| Average opening speed | m/s | 1.00.2 | ||||
| Average closing speed | m/s | 0.70.15 | ||||
| Opening time | At max operating voltage | s | 0.015-0.15 | |||
| At min operating voltage | 0.03-0.06 | |||||
| Closing time | s | 0.025-0.05 | ||||
| Main circuit resistance of each phase | μΩ | ≤120 | ||||
| Total thickness of permissible wear of moving and static contacts | mm | 3 | ||||
Product Advantage
1. Advanced Protection Functions: Feature three-stage composite protection including overcurrent delay, inrush suppression, and short-circuit interruption for reliable fault handling in distribution networks.
2.Intelligent Reclosing Capability: Support 1 to 3 automatic reclosures to minimize outage impact during transient faults, compatible with smart controllers for distribution automation.
3. Robust Environmental Resistance: Fully sealed enclosure with silicone rubber insulation, ensuring high resistance to moisture and condensation for reliable operation in high-humidity or tropical environments.
4. Safety and Low Maintenance: Maintenance-free design with no fire or explosion risks, coupled with compact size and lightweight construction for easy installation and long service life.
5. Broad Operating Range: Operates effectively across extreme temperatures from -40°C to +40°C, adaptable to harsh outdoor conditions.
6. Integrated Control and Monitoring: Enable remote operation via wired/wireless communication protocols (e.g., FTU modules), supporting "four telemetries" functionality for real-time monitoring and control.
7. Versatility and Expandability: Compatible with additional components like current transformers for dual-purpose protection and metering, and network reconstruction features to isolate faults and restore non-fault areas automatically.
Outline And Mounting Dimensions
