The Siemens 5UB1902 is the DELTA i-system Schuko socket that combines a spring-loaded hinged cover with an integrated labeling field — two features that are normally separate accessories. It is the only socket in the DELTA i-system range to include both in a single 55×55 mm flush-mount unit.

What does the hinged cover protect against?

The spring-loaded flap (opening angle 150°) covers the socket face when no plug is inserted. It provides mechanical protection against dust ingress, light water spray from cleaning, and accidental finger contact with the apertures. Note that the hinged cover alone does not make the socket IP44 — the unit remains rated IP20. For wet or outdoor locations, a dedicated IP44 weatherproof socket with a sealed enclosure is required.

How is this different from a standard socket with a separate labeling clip?

The labeling field on the 5UB1902 is moulded into the socket face and covered by a transparent film — not a clip-on accessory that can be lost or dislodged. This makes it suitable for installations where circuit identification must survive cleaning, maintenance, and years of plug insertions without the label peeling off or fading.

Does the hinged cover provide increased touch protection by itself?

No. The hinged cover is a mechanical barrier against casual contact, but the 5UB1902 also includes full increased touch protection (erhöhter Berührungsschutz) inside the socket itself — live and neutral apertures are internally shuttered. The cover is the first line of defence; the internal shutters provide protection even when the cover is open and a plug is partially inserted.