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
Selection details for CKJ3 Series 1140V 3-Phase AC Vacuum Contactor
To confirm the required vacuum contactor configuration for your project, include:
- Operating voltage, rated current, pole arrangement and load type
- Coil/control voltage, switching duty and required operating frequency
- Mounting dimensions, wiring diagram and protection coordination
Drawings and quotation requirements
Send the model reference, application, quantity and destination country together with the relevant drawing or existing equipment information. Confirm the selected configuration against a model-specific drawing and ratings sheet before ordering; request the applicable test documentation for your project requirements.
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