Make sure you use a slow-blow fuse, if you are using a large DC supply on the secondary, you could have a switch that controlled the DC side after the initial inrush on the primary.
Also with the VA Txfr rating you are using, the primary circuit should be rated at least 20amps.
There a are negative temparature thermisters but it would be rather large for your case.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.