Introducing our special offer on the ZW20-12F/630-20 Watchdog Vacuum Circuit Breaker, a highly efficient and reliable outdoor intelligent demarcation vacuum circuit breaker. Designed specifically for rural power grids, urban networks, and small power systems, this circuit breaker is engineered to handle load currents, overloads, and short circuits effectively. The unit features a three-phase common box structure, with the vacuum arc extinguishing chamber housed in a metal casing. Utilizing SMC insulation materials for both phase-to-phase and phase-to-ground insulation, it offers exceptional reliability and high insulation strength.
This circuit breaker can be equipped with a reclosing controller for applications requiring easy power access. Additionally, it can be fitted with PT types and reclosing controllers for scenarios without a power supply. Our smart circuit breakers are ideal for both radial and ring power supply systems, aiding in eliminating transient faults, restoring power automatically, and isolating permanent faults to support distribution automation. These intelligent circuit breakers offer 1 to 3 reclosing cycles, with adjustable recloser parameters. They include three-phase composite protection features like inrush current control, overcurrent protection, and short-circuit breaking, all with continuously adjustable settings. Furthermore, they possess a small current grounding protection function, also with continuous parameter adjustment capabilities.
The circuit breaker is designed to operate in AC 50Hz power systems, with a voltage range of 10 to 12kV, primarily for load breaking and closing duties. It provides overload and short circuit protection, quick-break protection, definite time delay protection, and an automatic reclosing feature. Users can opt to add lightning arresters or isolating switches (referred to as "combined intelligent circuit breakers") to suit their specific needs. Equipped with its own power supply, this circuit breaker supports both wired and wireless remote control operations and includes CT and PT interfaces to meet telemetry requirements.
At Yueqing Qixuan Electric Co., Ltd., we pride ourselves on delivering quality products that stand the test of time. We believe that today's quality is tomorrow's market, and we are committed to moving beyond traditional practices toward a more standardized future. Our goal is not perfection but continuous improvement.
In the event of a fault in a 10kV overhead distribution line, especially at T-branches or end-user points, the lack of proper coordination between the line input switch and substation outlet switch protection times can lead to unnecessary substation outages. By installing a user demarcation switch (or "watchdog") at these critical points, faults such as overcurrents, short circuits, or single-phase earth faults can be automatically detected and isolated, ensuring uninterrupted power supply to unaffected areas. Our ZW20-12F outdoor user boundary vacuum circuit breaker is a cutting-edge solution developed in-house. Comprising a ZW20-12 outdoor pole vacuum circuit breaker body, an FDR-02 fault detection controller, and an external voltage transformer, these components are electrically connected via an air socket and outdoor sealed control cable. This setup enables reliable detection of milliamp-level zero-sequence currents and phase-to-phase short-circuit fault currents, automatically isolating single-phase ground faults and phase-to-phase short circuits.
The ZW20-12F circuit breaker operates at 12kV with three-phase AC 50Hz, using vacuum arc extinction and SF6 gas as the insulating medium. Its gas-sealed, explosion-proof, and insulating structure draws inspiration from Toshiba's VSP5 technology. The inlet and outlet bushings boast enhanced sealing performance, ensuring superior overall sealing. The SF6 gas remains stable, unaffected by external conditions, and does not leak. The spring-operated mechanism undergoes miniaturization and optimization, improving reliability and stability compared to traditional designs. The main circuit employs an advanced bracelet-style structure for reduced contact resistance and lower temperature rise.
As a maintenance-free product, the ZW20-12F is a premium choice among outdoor high-voltage vacuum circuit breakers. It aligns with numerous national standards, including GB1984 for high-voltage AC circuit breakers and GB/T11022-1999 for general high-voltage switchgear specifications. Our after-sales service promises free repair or replacement within one year of purchase for any quality-related issues.
For optimal performance, the circuit breaker requires an operational power supply, typically sourced from an external operating power transformer or voltage transformer providing AC 220V. Users can select the appropriate voltage regulator or transformer type based on their needs, with outdoor fuses recommended for added protection. The breaker's secondary fuse configuration is detailed in the shipping documentation.
In summary, the ZW20-12F offers robust performance and reliability, making it an essential component for modern power distribution systems. At Yueqing Qixuan Electric Co., Ltd., we are dedicated to excellence, ensuring our products meet the highest standards of quality and innovation.
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