CKG3-7.2kV Series 3-Pole High Voltage AC Vacuum Contactor – 160A/250A/400A/630A Magnetic Switch for Industrial Motor Control & Circuit Protection
The CKG3-7.2kV Series 3-Pole Vacuum Contactor is a high-performance indoor electrical component designed for 7.2kV and 6.6kV power networks operating at AC 50Hz-60Hz. Engineered for the frequent starting and remote control of AC motors, this unit features an exceptional mechanical life of up to 1,000,000 operations. It is highly recommended for use in combination with high-voltage fuses and protective devices to replace traditional vacuum circuit breakers, providing a more efficient, low-maintenance, and reliable solution for mining, metallurgy, and industrial power distribution systems.
CKG3/4-7.2 Series 7.2kV Indoor High Voltage AC Vacuum Contactor (160A – 630A)
Product Overview
The CKG3/4-7.2 Series is a high-performance indoor AC high-voltage vacuum contactor designed for three-phase AC 50Hz-60Hz power systems. Specifically engineered for 7.2kV and 6.6kV environments, it provides a reliable solution for the remote making and breaking of circuits. This series is ideal for the frequent starting and control of AC motors, and it is highly recommended to be used in combination with fuses and protective devices as a specialized alternative to traditional vacuum circuit breakers.
Core Features & Technical Advantages
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Ultra-Long Operational Life: Engineered for heavy-duty industrial applications with a mechanical life of up to 1,000,000 operations.
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High Arc Extinguishing Capacity: Utilizes advanced vacuum interrupters to ensure rapid arc extinction and safe circuit breaking without external arcing.
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Precision Performance: Offers excellent contact stability with a rated opening distance of 3.5 ± 0.3mm and overtravel of 2 ± 0.2mm.
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Robust Insulation: Features high-strength ceramic or porcelain insulation frames capable of withstanding power frequency voltages up to 32kV.
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Optimized for Industrial Use: Specifically designed for high-frequency operating environments such as mining, metallurgy, and large-scale power distribution.
Technical Specifications
| Item | Unit | CKG-7.2/160 | CKG-7.2/250 | CKG-7.2/400 | CKG-7.2/630 |
| Rated Voltage | V | 7200 | 7200 | 7200 | 7200 |
| Rated Current | A | 160 | 250 | 400 | 630 |
| Making Capacity | A | 100 Times | 100 Times | 100 Times | 100 Times |
| Breaking Capacity | A | 25 Times | 25 Times | 25 Times | 25 Times |
| Mechanical Life | Ops. | 1,000,000 | 1,000,000 | 1,000,000 | 1,000,000 |
| Weight | kg | 25.5 | 25.5 | 25.5 | 36 |
Standard Working Conditions
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Altitude: Optimized for installations up to 1,000 meters above sea level.
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Ambient Temperature: Reliable operation between -5°C and +40°C.
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Humidity: Monthly average maximum relative humidity not exceeding 90% (at 25°C).
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Pollution Degree: Classified as Class 3 for standard industrial environmental suitability.
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