Normally Open Contactor Symbol

Output coil can be auxiliary contactor or main contactor coil.

Normally open contactor symbol.

Now let s go through a real world example of normally open and normally closed contacts that we are all familiar with. The given symbol indicates a normally open contact. Electric motor controls g. Relay symbols and electromagnets.

These have two states on or off. Normally open contact iec symbols. Iec 60617 sample drawing. Changeover contact this is the changeover contact of a relay that is closed or connected with one terminal known as normally closed terminal when the relay is deactivated the other terminal.

Normally closed nc contacts allow current through when the relay or contactor is not energized. Normally closed overload contacts. In other words when voltage is applied to the relay contactor terminals this contact closes. If the contact is normally open it would not allow any current to pass through it and hence there will be an open circuit at this contact.

This symbol is used to indicate normally close contact. Anywhere from 1 to 3 nc overload contacts are shown between the starter and l2 in all line diagrams. Rarely are these familiar examples good for learning but a 3 way switch is an excellent example of using normally open and normally closed switches. The contacts open when the relay activates to break the circuit.

There are two types of contacts no normally open and nc normally closed. Normally open no contacts allow current when the relay or contactor is energized. The relay are switching devices activated by signals. The switches pushbuttons circuit switches.

Some of the most common and widely used symbols are given below 1. To avoid confusion it is common practice to draw one set of nc overload contacts and mark these contacts all overloads ols. These are contacts of relays contactors timers counter field instrument switches pressure switches limit switches etc. Auxilliary contacts symbols for use in electrical pneumatic and hydraulic schematic diagrams.

Symbol of switches push buttons circuit switches. It is the contact of relay that is in closed position when there is no power supplied. Relays and contactors have two types of contacts each suited for different applications. Available in svg png jpg dxf dwg formats.