Answer Posted / vinod

relays/ pressure switch/temprature swicth etc. have NO & NC
contacts
NO (Normally Open) means the contact of the relay will be
open during the relay coil de energised condition and
contact close when relay coil energised condtion.But in
thermal switch NO means swich conacts open during the set
temprature and close when the temprature exced the set
value.
NC (Normally Close)means the contact of the relay will be
close during the relay coil de energised condition and
contact open when relay coil energised condtion.But in
thermal switch NC means swich conacts close during the set
temprature and open when the temprature exced the set value.
NO & NC can be used in control/power circuit depends on
requirement.

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