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Machines, Rc Ds, Meters

August 12, 2017 18:07

How does the magnetic switch ?

Recently, magnetic actuators are increasingly being used in everyday life for remote lighting control, as well as powerful consumers of electricity: pumps, compressors, or even air conditioning.In future articles, we will tell you about how to connect the device to the network, and now look at issues such as the design and function of the magnetic starter.

  • Components apparatus
  • Scheme of
  • Scope


apparatus First, consider the device a magnetic starter.In fact, no complicated construction and includes a fixed and a movable part.To make the information more understandable, consider the design of the apparatus, based on the model of PME series:

device design PME

  1. contact springs, which provide smooth contact closure when the starter, as well as create the necessary pressing force.
  2. Contact bridges.
  3. contact plate.
  4. plastic traverse.
  5. Anchor.
  6. winding.
  7. W-shaped core part (fixed)
  8. Additional contacts.

addition, magnetic starter device can include shock absorbers, whose purpose - to soften the blow when starting the machine.In a series of PM12 dampers marked number 8, but they are more clearly shown in the second picture - the structure of the magnetic starter PAE-311 (denoted by "10").


We are told what is in magnetic starter, but this is unlikely to give you anything to understand, especially if your level of knowledge "in the electrical kettle."That all fell into place, then we consider the principle of operation of the apparatus.

Scheme of

The principle of operation of the magnetic actuator is not difficult - at power-button "Start", the electric current passes through the coil and magnetizes a movable anchor.As a result - the armature is attracted to the fixed part and the closure of the main contacts occur.The current flows through the circuit and the motor is turned on.If the power is turned off, the electric current disappears with the coil and it will demagnetize.This process will result in activation of the contact spring, which will return the armature to its original position.The main contacts are no longer closed and the circuit will be completely de-energized.

draw your attention to the fact that the instantaneous opening of the contacts occur not only after intentional power outage, but if the supply voltage drops more than 60% of the nominal value.

Now you know how a magnetic starter.As can be seen, the device works scheme is very simple.Visually see the principle of operation, you can video examples below.

visibility of
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detailed explanation of the specialist
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Well, the last of the main issues of Article apparatus - why there is a magnetic switch (pictured below its appearance is granted).As we have said previously, the purpose of this unit - circuit and open circuit, which is typical of large currents.Typically, actuators are used for remote control of electric motors, powered by a voltage of 220 or 380 volts.At home, the use of these devices is possible to create a system of street lighting or turn on high-power electrical consumers.

Electromagnetic release

So we looked at the device magnetic starter, his actions and the appointment principle.We hope that the information was interesting and useful for you.If suddenly you have any questions, ask them in the comments or special category - "FAQ"!

Also read:

  • How do street lighting in the country with their own hands
  • How to connect the power plant to the home
  • Wiring voltage relay