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In a NSX TMD Breaker the Ir Dial is Discrete or Continuous?

In a NSX TM-D Breakers, the Ir dial is continuous. Turning the dial is to adjust the distance between bi-metal and the tripping bar, it is continuously movement.

So if the dial is in between 0.7 and 0.8 , the Ir setting will be between but it may not be exact value as you don't know the distance exactly. 
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