Relay And Switch Connection And Principle

Relays and switches can use the parallel connection of the normally open contacts of the relay and the contacts of the switch to form a self-locking,

Then in the control main circuit, a normally closed switch is connected in series.

In this way, the following functions can be achieved. The normally open switch is pressed, the control circuit is connected, the relay is closed, and the relay contact remains closed.

If the normally closed switch is pressed, the control circuit is disconnected and the relay is disconnected.

When the relay is working, the electromagnet is energized, the armature is sucked down to make D and E contact, and the working circuit is closed. When the electromagnet is de-energized, it loses its magnetism, and the spring pulls the armature up and cuts off the working circuit. Therefore, the relay is a switch that uses an electromagnet to control the on and off of the working circuit.

The advantages of using a relay control circuit: use low voltage to control high voltage; remote control; automatic control.