Contactor is a type of electromagnetic switch that is used to connect and disconnect the circuit through a magnetic coil. That is, by stimulating or connecting this magnetic coil or coil, the contactor connects and connects the three-phase or single-phase circuit, and on the contrary, when the voltage of the coil is disconnected, the contactor is disconnected.

One of the most important and widely used equipment in industrial electricity and power systems is the contactor. Here we want to know and how to use this equipment.

This equipment is used to disconnect and connect remote power circuits by stimulating the coil inside the contactor through AC or DC voltage. Also, this equipment is one of the necessary components for D8%A8%D8%B1%D9%82">electric panel and it is also called electromagnetic switch (Electromagnetic Contact). This advantage makes it possible to disconnect and connect the circuit remotely and from any point. According to this definition, the contactor is used in high amperage using a function similar to the function of the relay. It can also be concluded that due to the use of high amperage, the speed of disconnecting and connecting its contacts is lower compared to the relay.

Types of contactors

About the types of contactors, the following can be mentioned:

• single-phase contactor
• three-phase contactor

On each contactor, there are one or two open and closed command contacts, which can be used in the command path and realizing the command parts of the circuit. Contactors are made for different current ranges and in different dimensions and sizes. 9 to 800 amperes can be mentioned among the most widely used amperes of contactors. Also, the coil voltage of the contactors can be varied and can be made in 24, 48, 110, 220 and 380 volts AC and DC. Contactor coils can be replaced in case of failure, and suitable coils can also be used for use in different desired voltages.

The difference between the electrical contactor and the key is that the connection and disconnection operations in contactors are done by a magnetic coil or coil, this magnetic coil converts electrical energy into magnetic energy, and when the power is disconnected and connected, this The magnetic field also disconnects and connects and causes the mechanical disconnection and connection of the contactor. Contactor coils are replaceable. Contactors up to 25 amps have one auxiliary contact either open or closed, and contactors from 32 amps above have two open two closed auxiliary contacts. When the contactor coil is without power, the open blade acts as an open switch and the closed blade acts as a closed switch. As soon as the bobbin is energized, the open blade closes and the closed blade returns. Auxiliary contacts are used in the contactor in different parts of the steering circuit. Another important use of auxiliary contacts is to create a contactor self-maintaining circuit, which, once the coil is stimulated, the contactor becomes self-maintaining by its own open blade, and if there is a conditional blade in the circuit path, it can be the contactor coil. without electricity.