Hello again, I see that none of our other several dozen HVAC experts here have picked up your question.
I notice that Honeywell does mention a resettable fuse, but does not show it anywhere, and I myself have never had an occasion to use the feature.
It is most probably that you simply made a wiring error when connecting the C wire... thats common an issue I deal with and solve all the time.
My situation is that after 51 years in the business and consulting nationally, most of the last 20 years on large scale projects for IBM, Texas Instruments, the US dept of Energy etc (nuclear safety controls issues) and a few of the major manufacturers such as Trane and Carrier...
....that, unfortunately of all the virtually hundreds of thousands if not millions of pieces of equipment ever built, I have only seen maybe 1% of them in person, and even at that, considering the array of defects that can develop I might have seen and corrected way less than 0.0001% of those defects.
I rely on my basic understanding of the various disciplines involved, that has worked out well for myself and others over the years.
Let me know if you if you want to continue, in that case attach a photo of how you wired the thermostats to the hz311 and where you picked up the 24v common.
we can go from there if you like, I will need you to accept the additional service offer in that case however.