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What is a TNC switch?


A Trip -Neutral-  Close (TNC) switch is used to manually Open and Close the Circuit Breaker(CB) either from Local or Remote.

This is called TNC switch as it has three positions namely 
  • TRIP 
  • NEUTRAL and 
  • CLOSE.
 This type of switch is spring loaded switch i.e. to close the CB one need to move the TNC switch from  Neutral position to Close position and then due to spring action , the switch will automatically  come to Neutral position. 
Thus ,even though the CB  is closed, the position of TNC switch will return to Neutral and same is the case in tripping the  CB also.  
சாதாரணமாக,பிரேக்கரை குளோஸ் பண்ணும் போது,டிரிப் பொசிஷனுக்குப் போய் விட்டு, பிறகு குளோஸ் பல்ஸ் கொடுப்பது நல்லது.

எழுதியவர் 
திரு.கலியபெருமாள் அவர்கள்,
Chief Engineer(Operation)-Retired



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