Relay A Diagram Is Shown Below To Illustrate The Operation Of A Relay - the circuit diagram of the induction type impedance relay is shown in the figure below this relay consists current and voltage element the relay has an aluminium disc to further illustrate how a relay works let s look at it as it functions within an electrical circuit first we need to know the symbols for the parts of a relay the illustration below shows the 3 symbols used in an electrical schematic to represent the 3 parts the coil a normally open a relay is switched by electrical power and not a human this is done by energizing a coil which is internal to the relay and by energizing the coil the relay changes state just like a wall switch would therefore when you energize a relay you are switching circuits off and on a typical relay switch circuit has the coil driven by a npn transistor switch tr1 as shown depending on the input voltage level when the base voltage of the transistor is zero.

or negative the transistor is cut off and acts as an open switch in this condition no collector current flows and the relay coil is de energised because being current devices if no current flows into the base then no current will flow relay terminology the iso mini relay we have looked at above has 4 pins or terminals on the body and is referred to as a make break relay because there is one high current circuit and a contact that is either open or closed depending upon whether the relay is at rest or energised an electromechanical relay is basically designed using few mechanical parts like electromag a movable armature contacts yoke and a spring frame stand these parts are showing in the internal pictures of relay below all these are arranged logically to form into a relay a fault in front of the relay may result in an impedance which satisfies the impedance conditions for operation.

but the voltage at the relaying point is dragged down and the resulting fault current is below the current supervision level and the element does not operate this is p div class b factrow b twofr div class b vlist2col ul li div author nely cordeiro div li ul ul ul div div div li relay contact symbols are shown with the same numbers or letters that are used to designate the relay coil all contact symbols that have the same number or letter as a coil are controlled by that coil regardless of where in the circuit they are located

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