File Name: difference between contactor and relay .zip
A contactor is an electrically-controlled switch used for switching an electrical power circuit. Unlike general-purpose relays , contactors are designed to be directly connected to high-current load devices.
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. The relay is an automatic electrical appliance, which is suitable for remotely connecting and breaking AC and DC small-capacity control circuits, and provides control, protection and signal conversion functions in the electric drive system. The input quantity of the control relay is usually the electric quantity such as current and voltage, and it can also be non-electric quantity such as temperature, pressure, speed, etc. The output quantity is the electrical signal sent by the contact or the parameter change of the output circuit. Contactors are divided into AC contactors voltage AC and DC contactors voltage DC , which are used in electric power, power distribution and electricity applications.
Home Search waterheatertimer. Search using. Use only volt wire. Lamp cord, extension cords are not rated volt. Use copper wire only. Aluminum wire is fire risk and should be avoided or installed by professional.
Difference Between Relay and Contactor. There is a lot of confusion around the industry about the difference between Relays and Contactors. 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. A relay is a type of electromagnetic switch which is operated based on the current change in a circuit. When an overload condition is detected in a circuit, it will trigger the electromagnetic armature of the relay to close or open depending on the configuration. The operating principle of the contactor is similar to the relay; the current flowing through the contactor energizes the electromagnet.
Relays are basically switches which are primarily used for the protection of equipment. It generally uses two circuits — A control circuit and a power circuit. The control circuit regulates the flow of power and performs the basic switching operation using a small amount of current which can in turn be used to control a circuit with a high amount of current.
According to the Institute of Electrical and Electronics Engineers :. Both perform the same task of switching a circuit! So What really differentiates the two devices? Relays are generally classified as carrying loads of 10A or less, while a contactor would be used for loads greater than 10A, but this definition, while simple, gives an incomplete picture. It leaves out any physical differences, or standards. Contactors are almost exclusively designed to operate with normally open Form A contacts.
When a relay is used to switch a large amount of electrical power through its contacts, it is designated by a special name: contactor. Contactors typically have multiple contacts, and those contacts are usually but not always normally-open, so that power to the load is shut off when the coil is de-energized. The top three contacts switch the respective phases of the incoming 3-phase AC power , typically at least Volts for motors 1 horsepower or greater. The auxiliary contact is often used in a relay logic circuit, or for some other part of the motor control scheme, typically switching Volt AC power instead of the motor voltage.
Contactors and Control relays are electrically operated switches used for switching of loads and for controlling the electrical circuit respectively. Since both he switches are used in same control panel, so it is confusing for the people to understand the difference between a contactor and control relay. Contactor and Control Relay work on same principle. They are basically electrically operated solenoid switches that are designed for the switching or control the loads. Moreover, both of them are constructed in a similar way:.
Relay and contactor are functionally doing same duty, but the major difference between relay and contactor is that, contactor can carry huge amount of current but relay can carry only less amount of current from 0. In this, we are going to see the 7 difference between relay and contactors. Contactor is an electromagnetic switch, which can be operated by giving external power supply.
Contactors and relays are two closely related terms leading to confusions and misinterpretations most of the times. Both of them are electrically operated switches used for control and switching of loads. This article can give you a clear picture of the difference between contactor and relay.
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