Answering my own question:
Dan from CTR electronics responded (via my email query) that it is listed at the top of page 8 of the wiring guide:
Wago connectors
The next step will involve using the Wago connectors on the PDP. To use the Wago connectors, insert a small flat blade screwdriver into the rectangular hole at a shallow angle then angle the screwdriver upwards as you continue to press in to actuate the lever, opening the terminal.
Two sizes of Wago connector are found on the PDP:
• Small Wago connector: Accepts 10AWG-24AWG, strip 11-12mm (~7/16")
• Large Wago connector: Accepts 6AWG-12AWG, strip 12-13mm(~1/2")
To maximize pullout force and minimize connection resistance wires should not be tinned (and ideally not twisted) before inserting into the Wago connector.
Thanks CTR for the quick response!