CKJ5 Series 1140V AC Low Voltage Mine Vacuum Contactor – 250A/400A/630A Heavy-Duty Magnetic Contactor for Explosion-Proof Starters
The CKJ5 Series AC Vacuum Contactor is specifically engineered for rigorous industrial and mining environments, supporting power systems with AC 50Hz-60Hz and a rated operating voltage of up to 1140V. Available in 250A, 400A, and 630A capacities, it is designed for long-distance circuit management and the frequent starting and control of high-power AC motors. This series is ideal for integration with thermal relays and protection devices to form explosion-proof electromagnetic starters, making it a trusted choice for sectors such as coal mining, metallurgy, petroleum, and chemical processing.
CKJ5 Series 1140V AC Low Voltage Mine Vacuum Contactor (250A / 400A / 630A)
Product Overview
The CKJ5 series is a high-durability AC vacuum contactor specifically engineered for long-distance circuit making and breaking in demanding power systems. Operating at AC 50Hz-60Hz with a rated voltage of up to 1140V, this series is a critical component for the frequent starting and control of AC motors in heavy industrial sectors. Its robust design makes it an ideal fit for mining, metallurgy, petroleum, chemical processing, and telecommunications.
Core Advantages
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Explosion-Proof Ready: Specifically designed to be integrated with thermal relays and various protection apparatus to form explosion-proof electromagnetic starters.
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Maintenance-Free Vacuum Technology: Utilizing vacuum interrupters ensures superior arc extinguishing, high reliability, and a long service life without the need for contact maintenance.
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High-Current Handling: Available in 250A, 400A, and 630A models to suit various power control equipment requirements.
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Stable Vertical Structure: Features a specialized orange insulated housing with a reliable spring-driven mechanism for consistent performance in harsh environments.
Technical Specifications
| Item | Unit | CKJ5-250 | CKJ5-400 | CKJ5-630 |
| Main Circuit Rated Voltage | V | 1140 | 1140 | 1140 |
| Rated Working Current | A | 250 | 400 | 630 |
| Control Circuit Voltage | V | 36, 110, 220, 380 | 36, 110, 220, 380 | 36, 110, 220, 380 |
| Opening Distance | mm | 2 ± 0.2 | 2 ± 0.5 | 2 ± 0.5 |
| Over Travel | mm | 1 ± 0.2 | 1 ± 0.2 | 1 ± 0.2 |
| Final Pressure | N | 78 ± 7.8 | 117.6 ± 11.8 | 196 ± 19.6 |
| Withstand Voltage (Main) | V | 4200 | 4200 | 4200 |
Standard Working & Installation Conditions
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Ambient Temperature: Reliable operation between -5°C and +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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Atmospheric Conditions: At +40°C, relative humidity should not exceed 50%; higher humidity (up to 90% at 20°C) is allowed at lower temperatures.
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Installation Angle: The inclination between the mounting surface and the horizontal or vertical surface must not exceed ±15°.
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Pollution & Vibration: Rated for Pollution Level 3 and Installation Category III; should be used in areas without significant shaking or shock.
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