Electrical Diagram Relay. In earlier days instead of plc or dcs like controllers relays are used as controllers. Cont ground chassis or frame not necessarily grounded plug and recp.
Here i am giving the standard symbols used for the electrical relay diagram. Normally open normally closed thermal over load grd ch recp pl tr tr tr tr cr m con cr m con ol idl coils relays timers etc. Comparing to other controllers it is very cheap.
Relays are switches that open and close circuits electromechanically or electronically.
Cont ground chassis or frame not necessarily grounded plug and recp. Interconnecting wire routes may be shown approximately where particular receptacles or fixtures must be upon a common circuit. Automotive relay diagram relays are switches controlled by electrical power like another switch computer or control module. Contacts time delay after coil normally open normally closed normally open normally closed relay etc.
