What Is The Reason For The Use Of Contactors In Control Circuits?

Contactors are used in control circuits to provide power to loads and control circuits of other devices. They can handle higher loads than standard relays, but they often require more wiring. 

A contactor like CHINT Event is a relay that is designed to power larger electrical loads than standard relays. Contactor voltage ratings include 24 volts, 120 volts, and 220 volts AC or DC current flow. 

When a 24-volt coil (coil) is de-energized (de-energized), the contacts open (open), interrupting current flow (interrupting)to the load or the control circuits of another device. Closed contacts can be used as a switch or relay to provide power (provide power) to the load or the control circuits of another device. 

Let’s understand why contactors are used in control circuits.

What Is The Reason For The Use Of Contactors In Control Circuits?

Designed To Power Larger Electrical Loads Than Standard Relays

Contactors are relays that are designed to power larger electrical loads than standard relays. They have contacts that can be opened by the control circuit and closed by the control circuit. A contractor can be either normally open or normally closed, depending on how it is wired in your circuit.

In a contactor, the contacts are held apart until energized, when they move together and become “closed” (connected). The opposite condition results from de-energizing them: they separate and become “open” (no longer connected).

It also has functions such as overload protection, zero phase protection, overvoltage protection, and under-voltage protection according to the requirements of application occasions

Supports Three Voltage Ratings

Contactors have three voltage ratings: 24, 120, and 220 volts.

  • A 24-volt contactor is used to control low-voltage loads such as air conditioning compressors and small motors.
  • A 120-volt contactor is used to control medium-voltage loads such as fans, pumps, and conveyor belts up to 15 amps in size.
  • A 220-volt contactor is used to control high-voltage loads such as electric heaters and welders up to 30 amps in size.

Control The Flow Of Current

Contactors are used to control the flow of current for larger loads than standard relays. When a 24-volt coil is de-energized, the contacts open, interrupting the current flow to the load. Contactors require more space than relays and have higher operating costs because they generally contain more parts than their relay counterparts.

What Is The Reason For The Use Of Contactors In Control Circuits?

Handle Higher Loads Than Standard Relays

Contactors, like relays, are used to control current flow. But unlike relays, contactors generally handle much higher loads than standard relays. Contactors are available with contacts rated for 24 volts AC/DC and 120/220 volts AC/DC and can be used as switches or relays.

Sophisticated Contactors Contain Logic Elements

Contactors are used to control the power of a circuit. They are basically small relays that have been designed for heavy-duty service. It is the ability of contactors to handle high currents and voltages that make them so useful in complex control systems. Sophisticated contractors may contain logic elements but are typically magnetically controlled.

Contactors can be controlled by other devices such as PLCs (Programmable Logic Controllers), electronic circuits, or even human intervention through push buttons or switches on panelboards or remote station controls.

High Switching Frequency And Long Service Life

Contactors have high switching frequencies and long service life, which make them more widely used than thermal relays and mechanical switches in modern industrial automation systems.

The contacts are closed and opened by the action of an external magnetic field generated by a relay coil or other sources such as another contactor or power supply.

Small Size, Lightweight, Easy Installation, And Maintenance

Because the contactor is a small device that can be easily installed in small spaces, it can be used in harsh environments. The contactor can be installed without space restrictions because it does not require a lot of space for installation.

What Is The Reason For The Use Of Contactors In Control Circuits?

Conclusion

To sum up, contactors are useful for relaying high-power loads that may require frequent switching, such as those found in an industrial application. The contacts can be used as a switch or relay to provide power to the load or the control circuits of another device. In addition, they have three voltage ratings: 24 volts, 120 volts, and 220 volts.

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