Thanks yes, as you say, a hot NTC is no good at current limiting. But how about this…..use 20mm diameter NTC of value 12R…..the mains current in it will be just 111mA RMS max (for 20W SMPS). So the NTC will be dissipating just 148mW……so the NTC will never warm up, so even if there is an ON/OFF/ON…..then the NTC will still offer up the 12R.
There are NTC’s which are specifically called “inrush NTC’s”…..it seems counter intuitive to think that a simple wire wound resistor could be better than them? (ie higher pulse rating)
__________________________--------------------------------
We think that inrush limiters will come of age with the total movement to solar/wind power…because this power is non-continuous, and I believe we will see regular mains outages during the day time, every where….so equipment that would normally be connected to the mains 24/7, and so only suffer inrush once in its life (at installation), will now suffer inrush every day, as the mains returns from its outages (even many outages per day). Do you agree?