Can you please explain why distribution cct's and cct's>32a must disconnect in 5 secs when <32a in .4 secs

Please spell out "CCT".

What is your situation?

What are you working on?

Why are you asking the question?

I am studying to become electrician and cct is circuit

OK, and the .5 seconds is by the protection of an RCD, residual current device?

What does your study materials state on this subject?

I suspect your dealing with RCD, and you may want to review these:

Residual-current device - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Residual-current_device)

Further to my original question. I want to know why circuits <32A must disconnect in .4 seconds and circuits >32A and distribution circuits must disconnect in 5 seconds by the overcurrent device.

Why not respond to my post to your original question? {Threads merged}

Are you dealing with RCD?

https://www.askmehelpdesk.com/electrical-lighting/electrical-questions-answered-free-690034.html