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VHZ4-12-16K-E
The v HZ/TR/M type electric chassis adds electric operation functionality to the original manually operated chassis, and is controlled and protected by a matching controller. It is the necessary hardware foundation to realize the requirements of intelligent, programmed, remote control and "one-key sequential control"of switchgear.
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VHZ4-12 VACUUM CIRCUIT BREAKER
Advanced Medium Voltage Vacuum Circuit Breaker with Exceptional Performance, Reliability, and Safety for Modern Electrical Power Systems
Product Overview
The VHZ4-12 vacuum circuit breaker represents the latest advancement in medium voltage switching and protection technology. Designed for demanding applications in modern power distribution networks, this circuit breaker combines superior performance with exceptional reliability and ease of maintenance.
Utilizing advanced vacuum interruption technology, the VHZ4-12 provides reliable protection for electrical systems up to 12kV. The modular operating mechanism and solid-sealed vacuum interrupter poles are integrated into a compact, robust metal enclosure. This design ensures optimal performance in various environmental conditions while maintaining a small footprint for space-constrained installations.
The VHZ4 series is renowned for its operational stability and extended service life. It is fully compatible with NX SAFE withdrawable switchgear, NX GEAR fixed switchgear, and equipment from other manufacturers. The circuit breaker is specifically engineered for controlling and protecting transformers, transmission lines, generators, motors, capacitor banks, and other critical components in electrical power systems.
Advanced Vacuum Technology
Utilizes cutting-edge vacuum interruption with copper-chromium alloy contacts for superior arc quenching and minimal contact erosion.
Enhanced Safety Features
Comprehensive mechanical and electrical interlocks prevent improper operation, ensuring personnel safety and equipment protection.
Maintenance-Friendly Design
Modular construction allows for easy inspection, maintenance, and component replacement with minimal downtime.
Technical Features & Specifications
High Breaking Capacity
Rated breaking current up to 40kA for reliable fault interruption
Extended Service Life
Mechanical endurance up to 30,000 operations, electrical endurance up to 10,000 operations at rated current
Enhanced Insulation
Full solid-sealed pole design with superior dielectric strength and pollution resistance
Environmentally Friendly
SF6-free design with minimal environmental impact and excellent fire safety characteristics
Core Technical Features
Long-Life Vacuum Interrupter
Utilizes advanced copper-chromium alloy contact material ensuring excellent breaking capacity and extended electrical life. Longitudinal magnetic field technology provides stable current interruption performance even under severe short-circuit conditions.
Fully Solid-Sealed Pole Design
Vacuum interrupters, primary circuit connections, and insulating operating rods are encapsulated in epoxy resin using APG (Automatic Pressure Gelation) technology. This provides complete isolation from environmental contaminants, moisture, and pollutants.
CO GEAR Operating Mechanism
Simple and reliable design with minimal components, modular design allows for easy removal from the chassis. Single spring energy storage combined with gear transmission ensures long mechanical life and consistent operating performance.
Advanced Interlocking System
Comprehensive mechanical and electrical interlocks prevent improper operation. The breaker cannot be closed unless fully engaged in test or working position; cannot be racked in or out when closed; includes provisions for padlocking and complete interlocking with other switching devices.
Main Technical Parameters
| Parameter | Unit | Value / Specification |
|---|---|---|
| Rated Voltage | kV | 12 / 17.5 (withstand voltage) |
| Rated Current | A | 630, 1250, 1600, 2000, 2500, 3150, 4000 |
| Rated Short-Circuit Breaking Current | kA | 25, 31.5, 40 |
| Rated Short-Time Withstand Current | kA | 25, 31.5, 40 |
| Rated Short-Circuit Duration | s | 4 |
| Rated Peak Withstand Current | kA | 63, 80, 100 (corresponding to breaking capacity) |
| Power Frequency Withstand Voltage (1 min) | kV | 42 (phase-to-phase, phase-to-earth) / 48 (across open contacts) |
| Lightning Impulse Withstand Voltage | kV | 75 (phase-to-phase, phase-to-earth) / 85 (across open contacts) |
| Mechanical Life | Operations | 30,000 (for 31.5kA and below) / 10,000 (for 40kA) |
| Electrical Life at Rated Current | Operations | 10,000 (for 31.5kA and below) / 5,000 (for 40kA) |
| Capacitive Current Breaking | Class | C2 (according to IEC 62271-100) |
| Closing Time | ms | 65 ± 10 (excluding relay time) |
| Opening Time | ms | 45 ± 10 (excluding relay time) |
| Operating Mechanism | - | Spring-operated, motor charged (AC/DC 110V/220V available) |
| Control Voltage | V | AC/DC 110, 220, 240 (standard), other voltages available |
| Protection Degree | IP | IP4X (compartment closed), IP2X (compartment open) |
Design & Construction Advantages
Mechanical Design
• Compact modular design for easy installation and maintenance
• Lightweight moving parts reduce operating energy requirements
• Corrosion-resistant stainless steel components for harsh environments
• Self-lubricating bearings for maintenance-free operation
Electrical Performance
• Low contact resistance for reduced energy losses
• Consistent opening and closing speeds independent of manual operation
• Excellent dielectric recovery after current interruption
• Minimal contact erosion extends maintenance intervals
Application Areas
The VHZ4-12 vacuum circuit breaker is suitable for a wide range of medium voltage applications across various industries. Its robust design and reliable performance make it ideal for both indoor and outdoor installations.
Power Substations
Primary and secondary distribution substations, transformer protection, and feeder circuits in utility networks.
Industrial Plants
Heavy industries, manufacturing facilities, steel plants, cement plants, and chemical processing plants.
Commercial Infrastructure
Shopping malls, hospitals, data centers, airports, and other large commercial complexes with critical power requirements.
Renewable Energy
Solar farms, wind power plants, biomass plants, and other renewable energy generation facilities.
Marine & Offshore
Shipboard power systems, offshore platforms, and coastal installations requiring corrosion-resistant equipment.
Mining & Water Treatment
Mining operations, water treatment plants, pumping stations, and other utility installations.
Typical Applications
Transformer Protection
Primary and backup protection for power transformers against overload, short-circuit, and earth fault conditions. Suitable for transformers up to 40MVA at 12kV.
Motor Control & Protection
Direct-on-line starting and protection for large motors in industrial applications. Provides overload, short-circuit, and phase failure protection.
Capacitor Bank Switching
Switching and protection of capacitor banks for power factor correction. Specifically designed for capacitive current switching duty (C2 class).
Feeder Protection
Overcurrent and earth fault protection for distribution feeders in utility and industrial networks. Compatible with various protection relays and control systems.
Safety Warnings & Installation Requirements
Only qualified and trained personnel should install, operate, or maintain this equipment. Failure to follow these instructions may result in severe injury, death, or equipment damage.
- Before commissioning, ensure the entire system is completely de-energized and properly grounded.
- Verify that control circuits are de-energized and secured against accidental or remote operation during installation and maintenance.
- Before installation or any maintenance procedure, ensure the operating mechanism spring is discharged by performing OPEN-CLOSE operations.
- Always use appropriate personal protective equipment (PPE) when working on or near energized equipment.
- Install and operate the circuit breaker only in accordance with the installation manual, applicable standards, and local regulations.
- Regular maintenance and inspection are essential for safe operation. Follow the recommended maintenance schedule in the manual.
- Never bypass or disable safety interlocks. These are critical for preventing hazardous conditions.
- Ensure proper ventilation and clearances as specified in the installation manual.
Installation Requirements
• Ambient temperature: -15°C to +40°C (for indoor installation)
• Maximum altitude: 1000m above sea level (derating may apply above this altitude)
• Relative humidity: ≤95% (daily average), ≤90% (monthly average)
• Seismic withstand: 8 degree intensity (according to GB standard)
• Pollution level: Degree III (maximum) according to IEC 60815
• Minimum clearances: Phase-to-phase 150mm, phase-to-ground 125mm (for 12kV system)
Maintenance Schedule
• Visual inspection: Monthly or as per site requirements
• Mechanical operation check: Every 6 months or after 2000 operations
• Comprehensive maintenance: Every 3-5 years or after 10000 operations
• Vacuum interrupter test: As per manufacturer's recommendation or if performance issues are suspected
Standards & Certifications
The VHZ4-12 vacuum circuit breaker is designed, manufactured, and tested in accordance with international and national standards to ensure safety, reliability, and performance.
Type Tests Performed
• Temperature rise tests at rated current
• Dielectric tests (power frequency and lightning impulse)
• Short-circuit breaking tests (including terminal fault, short-line fault, cable charging current)
• Mechanical endurance tests (30,000 operations)
• Electrical endurance tests (10,000 operations at rated current)
• Environmental tests (temperature, humidity, vibration)
• EMC tests for electronic components
Contact Information & Technical Support
HZPower Electrical Technology Co., Ltd.
Address: No. 1688 Innovation Road, Hangzhou, Zhejiang, China 310000
Technical Support Hotline: 400 881 0501 (24/7 for emergency support)
Email: technical@hzpower.com | Sales: sales@hzpower.com
Website: www.hzpower.com
© 2023 HZPower Electrical Technology Co., Ltd. All rights reserved.
Specifications are subject to change without notice. Always refer to the latest product documentation.
