How can current-limiting supplies be possible?
The name current limited power supply is a little misleading, because such a supply is also voltage limited. It delivers as much power as possible, without exceeding either the voltage limit or current limit.

If it's connected to an open circuit, it will be limited by voltage, because it takes no current to develop a voltage over an open circuit.

If it's connected to a short, it will be limited by current, because it takes to voltage to develop current through a short.

If it's connected to something else (0 &lt; \$R_L &lt; \infty\$), then it could be limited by current or voltage, but it's much more common to design circuits to be powered by voltage sources than current sources.