I don't think that would be a problem in our application. I think I'd prefer it if only the downstream tripped but at least that would be safe. Most of what I've read seems to point toward fuses having the best coordination capabilities but you go with what the man asks for.
"Whatever you are...
Thanks everyone, You've been a really great help.
I did find in the literature from the main breaker maufacturer that if the instantaneous trip can be turned off it should be (for coordination purposes) The short time pickup and delay is still in place. Of course the delay would have to be kept...
In case anyone wants to share in my frustration, The main breaker is a Masterpact NW20H with a Micrologic 6.0P electronic trip unit and a 1600 amp sensor plug. The Blower panel breakers are KH 36200. All of which are Square D. The loads serviced by the 200Amp breakers are 100HP blower motors and...
Situation:
Main control panel has a breaker rated at 1600A and several downstream 200A breakers with 100HP motor loads of 113FLA
The main breaker has Adjustable trips for Long, Short, Instantaneous and Ground fault.
The long, short and GF Have time adjustment as well
This breaker comes with...
