Introduction:
It is a mechanical switch but it preform electrically switching operation (i.e turn ON or OF current ) in an electronics or electrical circuit.
This type of switch is devanced or improved form of mechanical switch .In general type of Relay it consist of a solenoid and leaver carring with armature .Those are suspended on the constant body with the help of the spring .When solenoid enerasised it pulls lever downwards and vice-versa .Solenoid consist of extra power supply with the switch .When the switch of the solenoid is closed ,the armature is closed the relay contacts (i.e turn On or closed circuit). When the switch of the solenoid is open ,then the armature contacts of the relay is open (i.e turn OFF or open circuits).In this way this type of the switch is preform the switching operation .
Advantages:
Following are the advantages of the electro-mecanical switch over mecahnical switch;
This type of switch need a small power to perform its switching peration .This type switch handel large power.
- It has no risk of sparkings durings switching operation.
- This can perform switching operation from a distance .So it can handeled high voltages.
- In this type of switch relay current is smaller than load current.
Limitations:
* The speed of switching operation is very small.
* Littel wear and tear is possible because of moving parts.
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