This switch works fine, but it's pretty clear the wire is extremely fine gauge. With an average of 3A flowing, the similar wires into which it's plugged are cool, but the wires on each side of this switch are decidedly warm to the touch.
I'm using this for a on off switch for an ifi Zen DAC. The 5A power supply I'm using does not have an on off switch either and is out of the way. No discernable difference in sound quality or noise floor even in iems. Good cheap solution for an on off switch.