CKJ20 Series 1140V AC Low-Voltage Vacuum Contactor – 630A/800A/1000A for Motor, Transformer, and Capacitor Control
The CKJ20 Series AC Low-Voltage Vacuum Contactor is a high-reliability solution designed for power network systems with AC 50-60Hz and a rated voltage up to 1140V (with an upper limit of 1.6kV). Specifically engineered for 630A and 800A applications, it is the ideal choice for long-distance circuit management and the frequent starting and control of AC motors, transformers, and capacitor banks. Featuring stable performance, excellent compatibility, and a maintenance-free contact system, this series serves as an ideal modern substitute for traditional, old-fashioned vacuum contactor switches.
CKJ20 Series 1140V AC Low-Voltage Vacuum Contactor (630A / 800A / 1000A)
Product Overview
The CKJ20 series vacuum contactor is a high-performance electrical switching component designed for power network systems with AC 50-60Hz. It is engineered for main circuits with a rated voltage of up to 1140V (with an upper limit capacity of 1.6kV). This series is primarily utilized for the long-distance making and breaking of circuits and is ideal for the frequent starting and control of AC motors, transformers, and capacitor banks.
Core Advantages
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Maintenance-Free Operation: Utilizing vacuum technology for arc extinguishing, the contact system requires no maintenance throughout its long service life.
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High Reliability: Offers stable performance and excellent compatibility, making it the ideal modern substitute for old-fashioned traditional vacuum contactor switches.
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Enhanced Safety: The vacuum-sealed contacts ensure no exposed arcs, providing a safer environment for high-frequency industrial operations.
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Modular Design: Features a robust housing with high-quality auxiliary contact blocks for expanded control capabilities.
Technical Specifications
| Item | Unit | CKJ20-630 | CKJ20-800 |
| Main Circuit Rated Voltage | V | 1140 | 1140 |
| Main Circuit Rated Current | A | 630 | 800 |
| Making Capacity (A/100 times) | A | 6000 | 6000 |
| Breaking Capacity (A/10 times) | A | 4800 | 5000 |
| Limit Breaking Capacity (A/3 times) | A | 6000 | 6000 |
| Mechanical Life (10,000 times) | Times | 300 | 300 |
| Electrical Life AC3 (10,000 times) | Times | 60 | 60 |
| Contact Open Distance | mm | 2.5 ± 0.3 | 2.5 ± 0.3 |
| Overtravel | mm | ≥ 1 | ≥ 1 |
Standard Working & Installation Conditions
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Ambient Temperature: Reliable operation within a range of -5°C to +40°C, with a 24-hour average not exceeding +35°C.
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Altitude: The installation site altitude should not exceed 2000 meters.
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Installation Requirements: Designed for use in stable environments without significant shaking, shock, or vibration to ensure optimal performance of the vacuum interrupters.
Typical Applications
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Large-scale AC Motor Starting and Control
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Industrial Transformer Protection and Switching
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Power Factor Correction through Capacitor Bank Control
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