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.
Yes but that was my point Alasdair, if overload delay is the desire then the 4s delay setting is irrelevant as the instantaneous tripping current is much less.
Yes but that was my point Alasdair, if overload delay is the desire then the 4s delay setting is irrelevant as the instantaneous tripping current is much less.
