Is it 240V AC (i.e. LV) or DC, say less than 50V (i.e. ELV)? Assuming 3 wires means it's mains:

Terminal strip is pretty common for stuff like this in fluoro battens etc and commonly used in the industry for mains. The other choice is what we call a BP like this but still not a plug and socket.
https://www.sparkydirect.com.au/c/236777...tor-strips.html

Quicker to disconnect (need 3x) but somewhat dangerous to be touching live:
https://www.altronics.com.au/p/p2240-2way-32a-400v-ac-splicing-terminal-block/

Anything properly mains rated is likely to be too big I think. If it's mains why would someone be touching it and disconnecting it?

If it's just DC you have heaps of options