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The difference between circuit breakers and contactors: 1. Different natures Circuit breaker: Circuit breaker refers to a switching device that can close, carry and break the current under normal circuit conditions and can close, carry and break the current under abnormal circuit conditions within a specified time. Contactor: Contactors are divided into AC contactors (voltage AC) and DC contactors (voltage DC), which are used in power, power distribution and power consumption. In a broad sense, contactors refer to electrical appliances in industrial electricity that use coils to flow current to generate a magnetic field to close the contacts in order to control the load. 2. Different principles Circuit breaker: When short-circuited, the magnetic field generated by the large current (generally 10 to 12 times) overcomes the reaction spring, the release pulls the operating mechanism to operate, and the switch trips instantly. When overloaded, the current becomes larger, the heat generation increases, and the bimetallic strip deforms to a certain extent to drive the mechanism to operate (the larger the current, the shorter the action time).Contactor: When the contactor coil is energized, the coil current will generate a magnetic field. The generated magnetic field causes the static iron core to generate electromagnetic attraction to attract the moving iron core, and drives the AC contactor to move. The normally closed contact is disconnected and the normally open contact is closed. The two are linked. 3. Circuit breakers with different structures: Circuit breakers are generally composed of contact systems, arc extinguishing systems, operating mechanisms, releases, and housings. Contactor: AC contactors use main contacts to control circuits and auxiliary contacts to conduct control circuits. The main contacts are generally normally open contacts, while the auxiliary contacts often have two pairs of normally open contacts and normally closed contacts. Small contactors are also often used as intermediate relays in conju.