Class 2 power supply

Hopefully there is an EE with knowledge in that area here.

However, found this info on Signal Transformer web site.

UL1585: This standard covers Class 2 and 3 transformers, which are
current-limited devices designed to protect the user from the consequences
of an overload. The transformers covered by UL1585 can be either inherently
or non-inherently limited. Inherently limited transformers are designed so
that, in the event of a long-term overload, their impedance will be high
enough to keep them from being destroyed and causing a fire. Most will
continue to operate properly when normal conditions are restored.
Transformers contain a thermal or current fuse or an external fuse specified
by the manufacturer of the finished product.


Many 'wall wart' power cubes fall into this category.

Murray