The main components of AC contactor work are low-voltage coil and armature. It can be divided into single-phase and three-phase contactors, but the input power supply voltage level is different. Single-phase can only be connected to 220V, and three-phase can have 220v, 380v. . The working principle is very simple. After the coil wound around the iron core is energized, electromagnetic induction is generated, and the movable contact is sucked and closed, thereby turning on the main power source, meaning that the main power source is turned on and off by the electromagnet. In general, the coil voltage and current are not high, and the current is applied to a small current, mainly to attract the electromagnet, and the main contact can turn off a large current, drive a large load, and the voltage and current levels are high. The current and voltage parameters here are generally expressed in terms of contact capacity, in terms of how many volt-amperes. Some dynamic and static contacts are also externally attached to the contactor, and the functions of breaking and turning on the bypass by the coil suction are generally performed in pairs, that is, the normally closed contact and the normally open contact are paired. With the advancement of social sciences, many manufacturers have also developed some low-voltage long-life contactors, which have changed the design of electrical circuits and have higher safety performance. Relevant technical materials can be consulted in many places.
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