The Relay consists of coil and contact. Coil wire windings
is who gets an electric current, medium contact is a type of switch that
movement depending on the weather or not there is an electric current in the
coil. There are 2 types of Contact: Normally Open (the initial conditions
before enabled open) and Normally Closed (the initial conditions before being
activated close). Simply put the following working principles of the relay:
when Coil get electrical energy (energized), the electromagnetic force will
arise which will attract the armature that is berpegas, and the contact will
close.
In addition to functioning as an electronic component, the
relay also functions as a system controller. So that the relay has two kinds of
symbols used on:
- circuit (hardware),
- Program (software).
The following symbols are used:
In the data sheet, coil and contact information for
separate. This causes each have a different specification difference as well.
Note the following table.
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