The pluggable terminal block that plugs into the back of the SceneStation is Phoenix part number 1881338. It is a 3-position Spring Cage Terminal Block with a 2.5mm pitch.
It is designed to accept wires from 20-26 AWG.
For best results, strip the wire 8mm (0.3 inches).
To insert the wire, use a small tool to press the orange actuator to open the internal spring cage. Then insert the wire. After the wire is inserted fully, release the orange actuator.