Contactar electrical 4 pole working principle
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There are posts on the working of relays, types of relays and so on. To know about them click on the links below.
TAKE A LOOK : WORKING OF RELAYS
A contactor is also a type of relay. Although they have been explained in earlier posts, their wide use and significance needs to be explained in detail.
Features of Contactors
A contactor is a relay that is used for switching power.They usually handle very heavy loads like an electric motor, lighting and heating equipments and so on.Though their output is used for switching very high loads, they are controlled by a circuit with very less power.According to the loads they handle, they vary in sizes from a small device to as huge as a yard.Though they are used for switching purposes, they do not interrupt a short-circuit current like a circuit breaker.They have ratings ranging from a breaking current of a few amperes and 24 DC volts to thousands of amperes with many kilo volts.
Contactor – Design and Construction
Like a relay, a contactor also has
ContactSpringElectromagnet
The contact part of the contactor includes the power contacts as well as the auxiliary contacts. The power contacts gains the power for the contactor and the auxiliary contacts is used to bring a loop with the rest of the rest of the devices it is attached to. These contacts are connected to the contact springs.
The contacts are controlled by the electromagnet. These electromagnets give the initial force to the contacts and make them closed. Both these contacts and electromagnet are enclosed in a frame which is usually made of insulating materials. The usually used insulating materials are Nylon 6, thermosetting plastics and so on. They are useful, as they completely insulate the contacts and help in preventing the touch of contacts. For high-end contactors, an open-frame contactor is commonly used. This will provide a greater protection from oil, dust, weather and also from explosion. The type of frame housing used may also differ according to the voltage rating used. The ones given above are restricted up to a certain voltage. If the contactors are used to manage volts higher than 1000 volts, inert gases and also vacuum is used as frame housing.
Contactors are also used in DC circuits. For their use in DC circuits, magnetic blowouts are also used. The use of blowout coils help in stretching and moving the electric arc. The electric arcs can be AC or DC. An AC arc will have can be easily extinguished as they have low current characteristics. DC arcs of the same current characteristics need more stretching need more current to be blown out. They ratings differ from about 500 Amperes to about 1500 Amperes.
In order to save power in a contactor when it is closed, an economizer circuit is also introduced. This circuit helps in reducing the coil current. There is difference in the amount of power that is required to close the contactor and that from keeping it closed. Greater power is required to close it. This circuit will also help it to stay cooler. Take a look at the diagram given below.
TAKE A LOOK : WORKING OF RELAYS
A contactor is also a type of relay. Although they have been explained in earlier posts, their wide use and significance needs to be explained in detail.
Features of Contactors
A contactor is a relay that is used for switching power.They usually handle very heavy loads like an electric motor, lighting and heating equipments and so on.Though their output is used for switching very high loads, they are controlled by a circuit with very less power.According to the loads they handle, they vary in sizes from a small device to as huge as a yard.Though they are used for switching purposes, they do not interrupt a short-circuit current like a circuit breaker.They have ratings ranging from a breaking current of a few amperes and 24 DC volts to thousands of amperes with many kilo volts.
Contactor – Design and Construction
Like a relay, a contactor also has
ContactSpringElectromagnet
The contact part of the contactor includes the power contacts as well as the auxiliary contacts. The power contacts gains the power for the contactor and the auxiliary contacts is used to bring a loop with the rest of the rest of the devices it is attached to. These contacts are connected to the contact springs.
The contacts are controlled by the electromagnet. These electromagnets give the initial force to the contacts and make them closed. Both these contacts and electromagnet are enclosed in a frame which is usually made of insulating materials. The usually used insulating materials are Nylon 6, thermosetting plastics and so on. They are useful, as they completely insulate the contacts and help in preventing the touch of contacts. For high-end contactors, an open-frame contactor is commonly used. This will provide a greater protection from oil, dust, weather and also from explosion. The type of frame housing used may also differ according to the voltage rating used. The ones given above are restricted up to a certain voltage. If the contactors are used to manage volts higher than 1000 volts, inert gases and also vacuum is used as frame housing.
Contactors are also used in DC circuits. For their use in DC circuits, magnetic blowouts are also used. The use of blowout coils help in stretching and moving the electric arc. The electric arcs can be AC or DC. An AC arc will have can be easily extinguished as they have low current characteristics. DC arcs of the same current characteristics need more stretching need more current to be blown out. They ratings differ from about 500 Amperes to about 1500 Amperes.
In order to save power in a contactor when it is closed, an economizer circuit is also introduced. This circuit helps in reducing the coil current. There is difference in the amount of power that is required to close the contactor and that from keeping it closed. Greater power is required to close it. This circuit will also help it to stay cooler. Take a look at the diagram given below.
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