CKJ3 Series 1140V 3-Phase AC Vacuum Contactor – High Current 800A/1000A/1250A for Industrial Motor Control
The CKJ3 Series High-Current Vacuum Contactor is a robust solution designed for AC 50Hz-60Hz systems with a rated voltage up to 1140V (upper limit up to 2kV). Available in 800A, 1000A, and 1250A configurations, it is specifically engineered for long-distance circuit breaking and frequent starting of AC motors. Utilizing advanced ceramic vacuum switching tubes, this series offers a maintenance-free contact system, high breaking capacity, and a long service life. Its no-arc-exposure design makes it exceptionally safe and reliable for demanding sectors such as coal mining, electric power, chemical industry, and metallurgy.
CKJ3 Series 1140V 3-Phase AC Vacuum Contactor (800A/1000A/1250A)
Product Overview
The CKJ3 series belongs to our high-current vacuum contactor range, specifically engineered for demanding industrial environments. It is designed for applications in AC 50Hz-60Hz systems with a rated voltage up to 1140V (with an upper control circuit limit of 2kV). This series is primarily utilized for the long-distance connecting and breaking of circuits and is ideal for the frequent starting and control of high-power AC motors.
Core Features
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Advanced Arc Extinguishing: Utilizes a ceramic vacuum switching tube with high vacuum as the medium, ensuring no exposed arcs and significantly safe operation.
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Durable & Maintenance-Free: The vacuum-sealed contacts offer a long service life and require zero maintenance throughout their operational cycle.
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Robust Construction: Features an overall moulded special structure with no gaps, providing excellent sealing, moisture-proof, and explosion-proof capabilities.
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High Performance: Designed with a large creepage distance for enhanced water and dirt resistance, ensuring stable performance in harsh conditions.
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Compact Design: Despite its high current capacity (800A-1250A), the unit maintains a small volume and light weight, suitable for installation in medium voltage cabinets.
Technical Specifications
| Item | Unit | Data |
| Rated Working Voltage | V | 1140 |
| Rated Working Current | A | 800, 1000, 1250 |
| Rated Frequency | Hz | 50~60 |
| Industrial Frequency Tolerance (Vacuum Break) | KV | 10 |
| Lightning Impulse Withstand Voltage | KV | 8 |
| Mechanical Life | Times | 1,000,000 |
| Electrical Life (AC-2) | Times | 250,000 |
| Closing Time | ms | ≤ 200 |
| 3-Phase Non-Simultaneous | ms | ≤ 3 |
Standard Working Conditions
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Environment: Suitable for both indoor and outdoor installation.
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Ambient Temperature: Reliable operation between -40°C and +40°C.
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Altitude: Does not exceed 3000m (porcelain sleeve types limited to 1000m).
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Power Frequency: Stable within the range of 48Hz to 62Hz.
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Wind & Seismic Resistance: Wind speeds up to 35m/s and earthquake intensity of 8 degrees or below.
Industrial Applications
Due to its high breaking capacity and safety features, the CKJ3 series is widely adopted in:
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Coal Mining & Petroleum Extraction
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Electric Power Distribution
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Chemical Industry & Metallurgy
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