ZW8-12(G) Outdoor High-Voltage Vacuum Circuit Breaker

Overview

Operating Conditions

1. Ambient Temperature: -40 ~ +80°C;

2. Altitude: ≤2000m;

3. Wind Speed: ≤25m/s

Features

The ZW8-12(G) Outdoor Vacuum Circuit Breaker integrates advanced protection, automation, and communication functions to improve the reliability and intelligence of medium-voltage distribution networks.

Microcomputer-Based Protection

Equipped with a smart protection controller, the breaker supports three-stage overcurrent protection, including instantaneous protection, definite-time protection, and inverse-time protection. Protection thresholds and time delay settings can be flexibly configured according to different grid requirements.

Automatic Reclosing Function

The ZW8-12(G) supports up to three automatic reclosing operations with adjustable reclosing intervals and acceleration logic. Pre-reclosing and post-reclosing acceleration functions improve fault handling speed and coordination with upstream and downstream protection devices.

Intelligent Network Reconfiguration

For ring network distribution systems, the breaker supports distributed intelligent control. When a fault occurs, it can automatically isolate the fault section and restore power supply to unaffected areas. Additional functions include undervoltage tripping lockout, delayed reclosing, automatic reset, and backup protection configuration.

Electrical Measurement and Event Recording

The integrated measurement function enables real-time monitoring of voltage, current, and other electrical parameters. Operating data, fault records, and event information can be stored for system analysis and maintenance management.

FTU Integration and Four Remote Functions

The breaker supports FTU (Feeder Terminal Unit) integration and provides four remote functions:

• Remote control
• Remote measurement
• Remote signaling
• Remote parameter setting

It enables remote operation, condition monitoring, data display, and protection parameter adjustment for distribution automation systems.

Communication Interface and Protocol Support

Equipped with a standard communication interface, the ZW8-12(G) supports multiple communication methods, including fiber optic, wired, and wireless communication. It can operate as a remote terminal unit for intelligent distribution automation networks.

Wireless Remote Operation

An optional wireless remote controller allows operators to safely perform short-distance opening and closing operations without direct contact with the equipment.

Backup Power Supply

An optional built-in backup battery provides continuous operation for up to 12 hours after AC power interruption, ensuring reliable control and communication functions during outages.

Dual Power Supply Switching

The breaker supports automatic dual power transfer functions, including delayed closing, power-loss delayed opening, output voltage interlocking, and dual-side switch position interlocking, improving power supply continuity and system safety.

Technical Data

Additional Intelligent Functions

The ZW8-12(G) Series Outdoor Vacuum Circuit Breaker integrates multiple intelligent protection and automation functions to enhance distribution network reliability, fault response speed, and operational efficiency.

• Instantaneous and Overcurrent Protection
  Provides fast fault detection and protection against abnormal current conditions.
• Three-Time Automatic Reclosing
  Supports up to three automatic reclosing operations to improve power supply continuity after temporary faults.
• Event Recording and Anti-Inrush Protection
  Records operational events and provides anti-inrush current protection to improve system stability.
• Zero-Sequence Protection
  Detects ground faults and improves protection performance for distribution networks.
• Real-Time Clock and Status Monitoring
  Provides accurate time management and continuous monitoring of equipment operating conditions.
• Local and Remote Parameter Configuration
  Allows flexible adjustment of protection settings through local interfaces or remote control systems.
• Fault Self-Reporting and GSM Communication Alerts
  Supports automatic fault reporting and GSM message notifications for faster maintenance response.
• Smart Handheld Terminal Operation
  Enables convenient commissioning, parameter setting, and equipment management through intelligent handheld devices.

Applications

The ZW8-12(G) Vacuum Circuit Breaker is designed for intelligent protection and automation in 12kV medium-voltage distribution networks. It is especially suitable for urban and rural power systems with complex grid structures, fluctuating loads, or high requirements for voltage stability and operational reliability.

The breaker is widely applied in industrial facilities, substations, airports, ports, municipal power networks, and other distribution systems requiring reliable switching, remote monitoring, fault isolation, and smart automation capabilities.