Vacuum Circuit Breaker - O-C-O Cycle

Surely full information is in the User Manual supplied with it?

Open Closed Open Duty Cycle

It is a store energy breaker explained here : http://www.mikeholt.com/mojonewsarchive/EES-HTML/HTML/ElectricalCircuitBreakers~20030621.htm

Hello saurav The sequence of operation for testing a breaker for rated service short circuit breaking capacity is O-t-CO-t-CO . After this it can make, carry and break normal currents , but cannot clear any short circuit. For rated ultimate short circuit breaking capacity the sequence is O-t-CO.After this breaker is not tested for anything. The rated ultimate short circuit breaking capacity (Icu) and rated service short circuit breaking capacity (Ics) is given by the manufacturer after conducting the tests .Generaly Ics is a percentage of Icu . The following symbols are used for defining the sequence of operations : O --> represents a breaking operation CO --> represents a making operation followed,after the appropriate opening time, by a breaking operation. The time interval 't' between two successive short circuit operations, which shall be 3min or the resetting time of the breaker whichever is longer. Sibin

Since it s a HT breaker, the time interval 't' is in milliseconds. Also HT breakers don't differentiate between Icu or Ics

We have an expression here in the USA. "Putting the cart before the horse."

Are you sure you are ready to design circuits?

Sauravbabu, are you in any way related to our friend Coolyaar?