Finding a supplier for a Schuko insert

We are looking for someone who can find manufacturer/supplier of a Schuko type insert as shown in the pictures. One of the phases (L/N) should be connected to a cable to put a relay in between (as shown). Perfect would be if PE can also be connected by cable. Features: 250VAC/16A certified (CE/VDI) Schuko male plug Schuko female socket European suppliers prefered