We’re looking into the connector now.
As far as protecting your amp, no problem.
You can verify that by the fact that you can use the PL-IR without power per the manual on page 9, example #2.
The internal power supply converter has a safety feature that shuts it down if there is a voltage surge or multiple shutdowns. If you leave the supply disconnected for a while (usually 10 minutes), it will come back up on next power up.