What is the purpose of a contactor relay?
Summary. A contactor is a special type of relay used for switching an electrical circuit on or off. They are most commonly used with electric motors and lighting applications.
What is a contactor in PLC?
A contactor is a device that is used to control the supply of a three-phase power supply in an electrical circuit. The contactor’s role is to switch on or off the power supply to its connected output load.
What is the difference between a contactor and a switch?
A contactor is an electrically-controlled switch used for switching an electrical power circuit. A contactor is typically controlled by a circuit which has a much lower power level than the switched circuit, such as a 24-volt coil electromagnet controlling a 230-volt motor switch.
What is the difference between relay and contactor PDF?
Relays are used to control contacts of an electrical circuit due to a change of parameters or conditions in the same circuit or any other associated circuit. Contactors, on the other hand, are used to interrupt or establish connections in an electrical circuit repeatedly under different conditions.
What is the main function of contactor?
What are two basic types of contactors?
There are different types of contacts in a contactor, and they are; auxiliary contact, power contact, and contact spring. The power contact has two types that are; stationary and movable contact.
Why contactor is required?
Why are Contactors Used? Contactors are used for high power applications. They allow a lower voltage and current to switch a much higher power circuit, so they are generally larger and more heavy-duty than control relays, enabling them to switch higher power loads on and off for many thousands of cycles (Figure 1).
What is the difference between a relay and a contactor?
Both relays and contactors are electromagnetic switching devices, relays are switching devices that work in the control loop, and contactors are switching devices that work in the main loop.
What is the difference between contactor and auxiliary contact?
For example, the contactor may transmit power to the motor, while the auxiliary contact is in the control circuit of the motor starter and commonly used to turn on a pilot light indicating the motor is operating. 4. Safety Features (Spring-Loaded Contacts)
Which coil is used to open and close a contactor?
An electromagnetic coil is provided for opening and closing of contacts. The contacts are opened and closed by exciting this electromagnetic coil. A Contactor is used for switching of motors, capacitors, lights etc, that drains very high current. It has at least a single pair of three-phase input and output contacts. It would be normally open.
How does a contactor work?
In a broad sense, a contactor refers to an electrical appliance that uses a coil to flow current to generate a magnetic field and close the contact to control the load. The graphic symbol of the contactor is shown in the figure below, and the text symbol is KM. Wiring method of contactor
