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What is 0.3 sec in Duty Cycle “ O-0.3 sec - CO- 3min” on the Name Plate of the Cicuit Breaker?

 0.3 sec is the Dead Time
3 min is the Reclaim Time.

A Cicuit Breaker is considered Low Voltage Type, if its Rated Voltage is ?

Less than 1000 V.

For a High Voltage, AC CB, the Rated Short Circuit Current is passed for How much time?

3 Seconds.

In EHV CB’s, what is the Operating time between, instant of receiving the Trip Signal and final Contact Seperation?

0.03 seconds (30 milli seconds).