with i believe any thermal protection type, there are a couple ways it can trip or blow the fuse. A high spike in current that melts the fuse right away or a small current increase which might take a little longer to melt. Too much load can cause a rise in current that will blow the fuse. Check to see how much power your heating elements are consuming and compare to the power rating on your Helix(i believe it's 400 or 500 watts)

If it's in a newer building there should be a GFCI receptacle for every circuit, which will detect a current difference caused by shorts to ground and open the circuit.

Before you change the fuse, I would check for any shorts in the wiring or heating devices. If your equipment is not grounded properly, it can create a big hazard, even if everything work properly. For instance, lets say there is a short to a metal case or plate(like on freedom breeders) that is not grounded properly or does not have the ground plug plugged in, that plate can carry a high voltage that's just waiting to send a current through your body.

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