I'm reconsidering the fuses and reverse protection diodes on my design. It seems to me that with polyfuse the reverse protection diode on the heater output will burn out and burn the board long before the polyfuse will trip unless you get a very big diode. With car fuses, do you think a standard or reasonable current diode will last long enough to trip the fuse? For the HBP we're talking 10A. Or 5A I guess if you switch over to 24V.
Bryan
Bryan