Insteon devices are internally fused? (No, they are not!)

Myth:

I have found that most, and possibly all*, Insteon
“Bricks” are fused internally.

The Truth:

This is not true. In fact, most INSTEON products
are not internally fused.

The ApplianceLinc, PowerLinc Modems, and PowerLinc Controllers contain no fuses. There are also no designed-in fusible links within the components or circuit board(s).  (Fusible links, means that an component is designed act as a fuse, for example, a resistor is designed to fail at 125% of load.  This way the manufacturer has the same protection of a fuse, but without adding another component).

Although, if a fault were to develop within the electronics, one or more parts would open and cut off the supply of current. On most of the INSTEON products, during the Intertek ETL (the safety lab) safety testing, the engineer intentionally creates a shorted conditions within the electronics or the attached load to observe what happens and that it does not catch on fire. We have never failed this test.

There is a fuse installed in the LampLinc modules that is not required by the ANSI/UL-508 (the safety standard used to cover this product). We added it to ‘fail-safe’ the product after we found customers sometimes overloaded the X10 LampLinc Modules (made from 2001 to 2005) with too many Christmas tree lights. The fuse will open at 60% above the rated wattage.

The full conversation is here, the details regarding the Insteon products is from jlockyer.