I have several 800A Micrologic 2 MCCBs with only three adjustable settings Ir,tr and Isd. Ir is set at 0.7, tr is set at 4s at x6 Ir and Isd is set at 5. Is this not incompatible? My reckoning is that the Ir is 560A, tr holds an overload of 3360A for 4s but the short time pick up pulls the breaker out instantaneously at 2800A. All the devices are similarly set. There are no issues as a result but just wondering.
errata I know you have it now, but in case anyone else is bothered at some point. Should have read.
so we never see anything slower a trip time lower than about 5 seconds on the region 2 curve, as for any fault current above 2200A (~ 5 seconds) the fast action takes precedent (region 3).
errata I know you have it now, but in case anyone else is bothered at some point. Should have read.
so we never see anything slower a trip time lower than about 5 seconds on the region 2 curve, as for any fault current above 2200A (~ 5 seconds) the fast action takes precedent (region 3).
