CKJ5 series low-voltage AC vacuum contactor 250A 1140V multi voltage control coil

Description :

  CKJ5-250/1140 low-voltage AC vacuum contactor is an automatic control electrical device used for frequently connecting and disconnecting high current circuits, mainly solving the control problems of motor starting and stopping in harsh environments such as coal mines and chemical industries. This series of products uses a vacuum arc extinguishing chamber as the main contact, which has the characteristics of long electrical life, low maintenance workload, and no arc spraying. It is particularly suitable for AC power systems with a rated working voltage of 1140V and below and a rated working current of 250A. Typical working conditions include remote centralized control of underground coal mining machines, conveyors, pump stations, and other equipment, which can adapt to hazardous areas with high humidity, high dust, and explosive gas mixtures, ensuring the stable operation of the electrical control system.

  The core specifications of this low-voltage AC vacuum contactor are reflected in its electrical parameters and structural technology. The rated voltage of the main circuit is 1140V, and the rated current reaches 250A, which can meet the on-off requirements of high-power loads. The control coil voltage provides multiple specifications including 36V, 127V, and 220V, which are compatible with different control power systems and enhance the flexibility of on-site wiring. The product shell is usually made of high-strength insulation material or metal explosion-proof shell, with good internal vacuum bubble sealing and strong shock and vibration resistance. The implementation standards comply with relevant low-voltage switchgear and control equipment standards such as GB/T 14048.4, and some models have passed MA mining product safety mark certification to ensure intrinsic safety performance in flammable and explosive environments. The contact distance and overtravel are precisely adjusted to ensure stable contact resistance.

  When selecting CKJ5-250/1140 low-voltage AC vacuum contactor, it is necessary to focus on checking the load type and control voltage. Suitable for direct starting, reverse braking, and switching of capacitor compensation cabinets for three-phase asynchronous motors, especially for situations that require frequent operation and are sensitive to arcs. If the working environment is a non explosive ordinary industrial plant, open or protective structures can be used to reduce costs; If it is in a coal mine or petrochemical area, a specialized model with explosion-proof casing must be selected. Compared with ordinary air contactors, vacuum contactors have smaller volume and lower noise, but are slightly more expensive and sensitive to overvoltage. It is recommended to use them in conjunction with resistance capacitance absorption devices. Not suitable for DC circuits or high-frequency signal control scenarios. When selecting, it is necessary to confirm that the coil voltage is consistent with the control circuit power supply.

  When installing the CKJ5-250/1140 low-voltage AC vacuum contactor, it should be installed vertically on a flat mounting plate with an inclination of no more than 5 degrees, and ensure sufficient heat dissipation space around it. The wiring terminals need to be tightened with torque wrenches to prevent overheating and burning due to poor contact. In daily maintenance, regularly check the color change of the shielding cover of the vacuum arc extinguishing chamber. If severe oxidation or gas leakage is found and the indicator is activated, the vacuum bubble should be replaced immediately. Check if the auxiliary contact operates flexibly and if there is any abnormal noise when the armature is engaged. If there is any jamming, clean the mechanical transmission mechanism. Common faults include coil burnout, contact fusion welding, and control circuit disconnection. When troubleshooting, the coil resistance and control voltage should be measured first, and then the main circuit on/off status should be checked. It is strictly prohibited to open the explosion-proof cover for maintenance operations while it is live.

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