This is an IP44 rated industrial interlocked socket outlet unit. Grey enclosure with a red industrial socket (with white locking ring and red hinged cover) on the left and a rotary isolator switch on the right. Labels: green "IP 44" and yellow "With Interlock". The interlock mechanism ensures power is only on when a plug is properly locked in, improving safety for factory, workshop, construction site and 3-phase power distribution use.