AC contactor is a kind of intermediate control element, its advantage is that it can frequently pass, break the line, with small current control of large current. The thermal relay work can also play a certain overload protection role on the load equipment. Because it is relying on the electromagnetic field suction pass, off the work, relative to the human manual split, closing circuit, it is more efficient, more flexible use, can be divided at the same time, close multiple load lines, and self-lock function, through the manual short suction, you can enter the self-lock state of continuous work. AC contactors are widely used as power switching and control circuits. The AC contactor uses the main contact to open and close the circuit, and uses the auxiliary contact to perform the control instructions. The main contact point is generally only often open contact point, and the auxiliary contact point often has two pairs of contacts with normal open and normal closed function, and the small contactors are also often used as an intermediate relay with the main circuit. The contact point of the AC contactor, made of silver-tungsten alloy, has good electrical conductivity and high temperature corrosion resistance. The action power of the AC contactor comes from the AC electromagnet, which is stacked of two “mountain” shaped young silicon steel sheets, one of which is fixed, on the coil, the working voltage has a variety of choices. In order to stabilize the magnetic force, the suction surface of the iron core, plus the short-circuit ring. The AC contactor is reset by a spring after the loss of power. The other half is active core, constructed like fixed core to drive the opening of main and auxiliary contacts. The contactors above 20 amps are equipped with an arc extinguishing hood, using the electromagnetic force generated by breaking the electric circuit, to quickly pull off the electric arc, to protect the contact. AC contactor is made as a whole, the shape and performance are also constantly improving, but the function remains the same. No matter how important the technology is developed, ordinary communication contactors still have its important position.
Post time: Oct-24-2022
