I have found that most, and possibly all*, Insteon "Bricks" are fused internally. Unfortunately, the fuses are not in nice holders. Some, like the FilterLincs, are crimped into caps and then soldered onto circuit board. Others, like the ApplianceLinc, have the fuse crimped in series with the hot line input and encapsulated in shrink tubing. Also, they are not the usual small glass enclosed fuses, but a smaller & shorter 5mm x 20mm fuse.
However, with care, the fuses can be replaced. In fact, on my FilterLincs that seem to blow fuses more often, I simply added a fuse holder to the main circuit board to make future replacement easier.
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I also learned something interesting about the FilterLincs -- At least for the ones I have, the 5amp and 10amp versions are identical EXCEPT for the fuse, and I now notice that the 5amp version has disappeared from the SmartHome web site.
*Unfortunately, on the signal handling Bricks (APs, PLMs, PLC, etc.) I could not locate the fuse - I suspect it is a fused link buried in the transformer.