CKJ-250/1140 AC vacuum contactor

Main purpose and scope of application: low-voltage/vacuum contactor, suitable for connecting and breaking lines at long distances and frequently starting and stopping AC motors in power systems with rated operating voltages up to and rated operating current up to 3. Combined with various protection devices (B electronic comprehensive protector, R-type overcurrent protection device, resistance-capacitance absorption device) to form a magnetic starter, it is especially suitable to form an explosion-proof magnetic starter.
. Product Features
Using vacuum arc extinguishing technology, it has the characteristics of strong self-making and breaking capabilities, long electrical life, high working reliability, and almost no noise during operation
.Using Environment< br/> .The altitude does not exceed
b. The maximum ambient air temperature does not exceed +℃ and the minimum minimum does not fall below -℃
The relative humidity of the surrounding air does not exceed (at +℃)
. The inclination between the installation and the vertical surface does not exceed 0.
. No significant impact, vibration and shaking
. No gas and vapor environment that can corrode metal and destroy insulation
. In the absence of rain Places invaded by snow
.In environments with level 3 pollution or below
.Use category:.
. Model composition and its representative significance
Contactor vacuum AC design serial number rated current and rated voltage
Overall structure, working principle and working characteristics
. Vacuum contactor is mainly composed of vacuum sterilizer The arc system, electromagnetic system, lever transmission system, auxiliary contacts, rectifier device, insulating frame, base and other components have few components and are compact in structure
. The contacts are enclosed in a vacuum arc extinguishing chamber isolated from the outside world. Its work will be affected by external pollution
. Using vacuum as the arc extinguishing medium, it has strong breaking capacity and long electrical life. For example, the average electrical life is 30,000 to 10,000 times, and some products can be as high as 10,000 times or more. This has a negative impact on other contacts. It is difficult for the device
. The arc will not spray out (that is, the arc spray distance is zero), and it will not cause fires, explosions and other accidents
. Gases harmful to the human body will not be diffused during the working process. Ensure a clean working environment
. The contact opening distance is small and the overtravel is short, which is approximately equal to /~/ of an air contactor of the same capacity, thus making the entire contactor small in size and light in weight, which is a combination The selection of electrical appliances and complete sets of devices provides affordable products
. The control circuit is composed of a DC magnetic system and a rectifier device
. There is almost no noise during the working process, ensuring a quiet working environment
. AC power supply It can be used with DC power supply, making it convenient for users to choose.
Product use and operation methods
3. Preparation and inspection before use
3.. Before use, check whether the product connection is loose or falling off
3.. Power cord and wiring Whether the column is reliably fixed and the specified electrical clearance and creepage distance are maintained
3. Use and operation methods
.. Install the contactor according to the usage environment
3.. Set the rated control voltage Directly connect to the terminal block on the contactor power board (already reserved).
Parameter setting and debugging
. After checking that the voltage level and related technical parameters are correct, power can be sent for debugging
. This contactor has been adjusted at the factory and generally does not need to be adjusted. When replacing the vacuum switch tube and need to adjust it, please follow the following steps:
) Loosen the soft coupling screw and locking nut, unscrew the pull rod, then loosen the screw that fixes the vacuum tube, take out the damaged tube, and then proceed in the reverse order Replace the vacuum tube with a new one of the same specification and model
) To adjust the opening distance, turn the adjustment lever (clockwise), and use a vernier caliper to measure it, so that the contact opening distance reaches the technical requirements and the three phases are synchronized. Then tighten it
3) For the newly replaced vacuum switch tube, the power frequency withstand voltage method can be used to test the vacuum degree. It is required that the pressure withstand duration when the distance is opened. After the test, there should be no breakdown and continued flashover. If this condition does not exist, you can use a megohmmeter to measure the insulation resistance of the tube. The insulation resistance of the new vacuum switch tube should be greater than .