I have a predicta that has on of those, next time I pull it I may end up making my own out of a thermistor/fuse/resistor. The resistor will be sized to drop the B+ to what ever it should be after the thermistor warms up. The fuse will be a fast blow since the theremistor will reduce the inrush, that way the fuse can be set to just above the max B+ current for max protection.
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