Details about magnetic contactors.
Many of us have heard the name of magnetic contactor more or less. Today we will learn more about magnetic contactors. Magnetic contactors are a very interesting subject. This is a little complicated for many of us. In this article, I will try to discuss it in simple language. As a student in the electrical department, you should have a clear idea about the magnetic contactor. So let’s see without delay what questions of magnetic contactors will be discussed.
A magnetic contactor is an electromagnetic-driven switch. It is often used to control motors in many large automation industries. Its function and reel function is very similar. Then the question may be friends, maybe anyone. But no, relays are usually used at low power voltages, and magnetic contactors are used at high power.
What is SSR? Why is it used?
When we create small projects in electronics, we see in many cases that we are using relays. It is used in motor control automation in many large industries. So we can say that a magnetic contactor is a load conductor that is used to turn a powerful electric motor or load on and off.
Structure of magnetic contactor
Its structure is very simple. Magnetic contactors consist of the following. These contacts are auxiliary contacts. The load is created in automation mode or protection circuit using normally close and normally open contact. Normally close: When its coil is not energized in normal close condition, its auxiliary contact is off.
Like the reel, it also has an internal coil. Its coils are of two types AC and DC. The coil terminals are usually (A1, A2). Its coils are usually in the range of AC 220v, 360v, 440v DC 24v, etc. However, it can also be of different ranges.
It has terminals like (L1, L2, L3 & T1, T2, T3 or R, S, T & U, V, W) for three-phase connection. A three-phase power connection is made at the upper end (L1, L2, L3) and a three-phase motor connection is made at the lower end (T1, T2, T3). It also contains auxiliary contact NO, NC (normally open and normally close contact).
Normally open: its auxiliary contact is open. When current passes through a contactor, an electromagnetic field is created and a magnetic field is generated. This magnetic field attracts the moving core. The core of the contactor starts spinning which helps to energize the moving contact.
Moving and fixed contacts create short circuits. Through this, the current passes through the next circuit. In the beginning, the armature coil carries a lot more current. The passage of this current through the coil decreases very quickly. When the current stops, the coil is de-energized and the contact is opened.
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