What is the function of relay and contactor?
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?
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.
Why use a relay instead of a contactor?
Contactors are almost exclusively designed to operate with normally open (Form A) contacts. Relays on the other hand can and often are both Normally Open and/or Normally Closed depending on the desired function. This means that with a contactor, when it is de-energized there is (typically) no connection.
Why do you need a contactor?
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).
Where are relays used?
Relays are used wherever it is necessary to control a high power or high voltage circuit with a low power circuit, especially when galvanic isolation is desirable.
What is relay function?
Relays control one electrical circuit by opening and closing contacts in another circuit. Relays are generally used to switch smaller currents in a control circuit and do not usually control power consuming devices except for small motors and Solenoids that draw low amps.
Which is better relay or contactor?
Control Relay is more commonly used in control circuits which are single phase circuits. Contactors are typically built for switching 3-phase load….Contactor vs Control Relay: Difference between Contactor and Control Relay.
| When to Use a Control Relay | When to Use a Contactor | |
|---|---|---|
| 3 | Up to 250VAC | Up to 1000VAC |
Is a relay the same as a capacitor?
You will often see capacitors placed across the coil contacts of a relay. A capacitor takes some time to charge up, so it can be used to make a time delay relay. Warning: A capacitor and a relay coil (which is basically an inductor) are both energy storage devices.
What is the different between contactor and relay?
Load Capacity. Contactors are used in control circuits with both low and high Ampere capacity that is between 15A to 12500A. Relay on the other hand, is used in control circuits with low Ampere capacity, that is, between 10A and 15A…
What is the purpose of a contactor and a relay?
Contactors and relays are used on almost all heating, cooling, and refrigeration equipment for the operation of loads in the system . Contactors relays are similar in their operation because both contain a coil that is used to open or close the contacts.
What are the three major parts of a contactor or relay?
There are three major parts of a contactor or relay: the coil, mechanical linkage and contacts. The coil is used to create a magnetic field and is rated based on voltage (24 V, 120 V, 208/204 V, 480 V). The mechanical linkage connects the armature to the contacts when the coil is energized, completing the circuit.
What is the advantage of using contactor?
One-third less footprint and clearance requirements