The cable which all Teltonika Routers appear to use is the 4-pin Molex MicroFit 3.0, per https://www.reddit.com/u/rokejulianlockhart/comments/167lfed/comment/k2pfjit/?utm_source=share&utm_medium=web2x&context=3. I don’t believe that this is explained anywhere obvious, and can be immensely important when looking for a configuration which Teltonika doesn’t sell, like a version with an IEC 60320 connector at its AC end rather than a country-specific plug.
Regardless, I do recommend
https://teltonika-networks.com/products/accessories/powering-options/uk-power-supply-62whttps://teltonika-networks.com/products/accessories/powering-options/4-pin-to-4-pin-power-cable-1
with an honourable mention to
https://teltonika-networks.com/products/accessories/powering-options/4-pin-power-adapter-with-io-access-1https://teltonika-networks.com/products/accessories/powering-options/4-pin-to-barrel-socket-adapter-1
because no other company provides such standardized and comprehensive options for 4-pin Molex MicroFit 3.0-compliant power cables. All options can be seen at https://teltonika-networks.com/products/accessories/powering-options/?page=1.
I’m unable to add this as an answer to What power connectors do Teltonika routers use? so if you’re a moderator, please merge this and reopen the thread.