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CKG4 Series High-voltage 12kV 3 pole AC Vacuum Contactor
Product Overview
The CKG4 Series 12kV AC Vacuum Contactor is a high-performance three-phase switching device specifically designed for medium-voltage power systems up to 12kV. Utilising advanced vacuum interruption technology, robust insulation materials, and a durable mechanical structure, it delivers reliable switching performance for applications that require frequent operation.
With excellent electrical endurance, long mechanical life, and stable operating characteristics, the CKG4 series is widely used in motor control, transformer switching, capacitor banks, substations, power plants, and industrial distribution systems.
Key Technical Specifications
| Item | Specification |
|---|---|
| Model | CKG4 Series |
| Type | AC Vacuum Contactor |
| Rated Voltage | 12kV |
| Rated Current | 160A / 250A / 400A / 630A |
| Power Frequency Withstand Voltage | 42kV |
| Lightning Impulse Withstand Voltage | 75kV |
| Mechanical Life | 500,000 Operations |
| Electrical Life (AC-3) | 250,000 Operations |
| Electrical Life (AC-4) | 100,000 Operations |
| Closing Synchronization | ≤2ms |
| Contact Overtravel | ≥1.5mm |
| Weight | Approx. 30kg |
| Phase | Three Phase |
Key Features
Advanced Vacuum Interruption Technology
The CKG4 vacuum contactor adopts high-quality vacuum interrupters that quickly extinguish arcs within the vacuum chamber during switching operations.
Benefits include:
Fast arc extinction
Minimal contact wear
Maintenance-friendly design
High switching reliability
Suitable for frequent operation applications
The vacuum interruption system significantly extends equipment lifespan while improving operational safety.
Excellent Insulation Performance
The contactor utilises premium resin insulation components with outstanding resistance to environmental stress.
Advantages:
High-temperature resistance
UV resistance
Anti-aging performance
Excellent dielectric strength
Long-term insulation reliability
Electrical insulation ratings include:
Power Frequency Withstand Voltage: 42kV
Lightning Impulse Withstand Voltage: 75kV
These ratings ensure stable operation under demanding utility and industrial power system conditions.
Premium Copper Conductive Components
Critical current-carrying parts are manufactured from high-conductivity copper to minimise electrical losses and improve overall efficiency.
Benefits:
Lower contact resistance
Reduced temperature rise
Improved conductivity
Enhanced current-carrying capability
Longer service life
The optimised conductive path contributes to stable performance during continuous operation.
Stable Operation & Reduced Failure Risk
The CKG4 series incorporates a high-performance control circuit and an optimised mechanical transmission system.
Features include:
Reduced coil heating
Reliable closing and opening performance
Closing synchronisation ≤2ms
Contact overtravel ≥1.5mm
Consistent switching operation
The optimised design minimises risks associated with misoperation, contact bounce, and mechanical sticking.
Long Service Life for Frequent Switching Applications
Designed specifically for applications requiring frequent operation, the CKG4 offers exceptional endurance performance.
Life expectancy:
Mechanical Life: 500,000 operations
AC-3 Electrical Life: 250,000 operations
AC-4 Electrical Life: 100,000 operations
This makes the contactor particularly suitable for motor starting, industrial automation, and repetitive switching duties.
Robust Construction for Industrial Environments
The enclosure and structural components are manufactured using corrosion-resistant materials to withstand demanding operating environments.
Advantages:
Corrosion resistance
Mechanical durability
Stable operation under vibration
Reduced maintenance requirements
Long operational lifespan
Typical Applications
The CKG4 Series 12kV AC Vacuum Contactor is widely used in:
Medium-voltage motor control systems
Mining equipment
Power plants
Electrical substations
Utility power distribution systems
Industrial automation systems
Transformer switching applications
Capacitor bank switching
Commercial buildings and shopping centers
Urban power distribution networks
Why Choose CKG4 Vacuum Contactors?
Proven vacuum interruption technology
12kV medium-voltage rating
Up to 630A rated current
Excellent insulation performance
Long electrical and mechanical life
Stable operation under frequent switching conditions
Premium copper conductive components
Low maintenance requirements
Custom Service
We provide customised solutions for:
Rated current selection
Auxiliary contacts
Control voltage options
Cabinet integration
OEM branding
Special project requirements
Contact us for technical specifications, drawings, quotations, and project support.
