Based on this product's specifications, here are some alternatives and similar models
Recessed Through-Way Socket PCE Design Series 16A 3P+Z+N 400V IP44 (model 885-6v)
Summary description:
Recessed through-way electrical socket from PCE Design series, rated 16 A with 3 phases plus earth and neutral (3P+Z+N) for 400 V installations. Built for flush mounting, the unit provides IP44 protection suitable for indoor and sheltered outdoor use. Intended for temporary or permanent power distribution where a pass-through, lockable or continuous feed connection is required.