The Siemens 5UB1405-0KK combines two independent design options — increased touch protection and clawless mounting — in a single DELTA profil SCHUKO socket. It is the socket for the intersection of safety-code compliance and hollow-wall construction.

Where do both requirements overlap?

Modern public buildings — schools, clinics, municipal offices — are increasingly built with drywall interior partitions. The same building codes that mandate increased touch protection (VDE 0620) for publicly accessible areas also mean the electrician is working with plastic or thin-walled flush boxes behind plasterboard. Standard claws cannot grip drywall boxes reliably and risk cracking plastic enclosures. The 5UB1405-0KK addresses both constraints simultaneously: the contacts are recessed to code, and the body screws directly into the box lugs without relying on claw expansion.

Is this a common specification?

It is a niche within a niche — most projects will specify either increased touch protection (5UB1405) or clawless mounting (5UB1403-0KK) but not both. The 5UB1405-0KK exists for the relatively small number of installations where the two requirements genuinely overlap, and its longer lead time reflects that specialized demand. If only one of the two constraints applies to your project, the single-feature variant is more readily available and more cost-effective.