This is also called a changeover device because the common contact changes from the normally closed position to the normally open position when the coil is energized in a relay or a magnetic field is nearby in a reed switch.
Normally open auxiliary contact symbol.
Available in svg png.
Normally closed nc contacts allow current through when the relay or contactor is not energized.
It consists of a coil and a number of auxiliary normally open or normally closed contacts.
Those that are closed in the non activated state or those that are open.
Normally open terminal normally closed terminal and common terminal respectively.
Each symbol means a single terminal itself.
There are two basic auxiliary contact types.
In other words when voltage is applied to the relay contactor terminals this contact closes.
There are two types of contacts no normally open and nc normally closed.
A form c would have 3 leads and would have 1 normally open and 1 normally closed circuit.
These are known as normally closed n c and normally open n o contacts.
These have two states on or off.
On the other hand contact point a contact point b and contact point c represent contact structures.
Normally open no contacts allow current when the relay or contactor is energized.
Form c contacts change over or transfer contacts are composed of a normally closed contact pair and a normally open contact pair that are operated by the same device.
We can tell this switch is a normally open no switch because it is drawn in an open position.
When voltage is applied this contact opens and interrupts current.
Auxiliary contact 1nc 1no.
These are contacts of relays contactors timers counter field instrument switches pressure switches limit switches etc.
No terminal nc terminal and com terminal represent contact terminals symbols.
A limiting condition is wired through the coil contacts and resulting conditions are wired through the.
Iec 60617 sample drawing.
Auxiliary contact 1nc 1no.
There is a common electrical connection between a contact of each pair that results in only three connection terminals.
Output coil can be auxiliary contactor or main contactor coil.
The n c contacts are for example used as electrical interlocks where two contactors are used for forward reverse operation.
Normally open contact iec symbols.
The lamp will energize only if someone presses the switch holding its normally open contacts in the closed position normally open switch contacts are sometimes referred to in the electrical industry as form a contacts.
