Why would you need a labeling field on a socket?

The 5UB1933 has a transparent labeling window built into the cover plate. Slide in a paper strip with the circuit number — "L1.1-F3", "UPS-B", "Server Rack 4" — and every electrician who works on that room knows immediately which breaker controls which socket. In commercial installations where multiple circuits share a single wall, this turns a ten-minute breaker-hunt into a glance. The labeling field accepts any user-cut paper strip; no proprietary label sheets, no special printer.

How does the 5UB1933 compare to the carbon metallic 5UB1923?

Both are single-feature labeling sockets: one labeling field, no hinged cover, no increased touch protection, no status indicator. The 5UB1933 is aluminum metallic (~RAL 9006, 91 g); the 5UB1923 is carbon metallic (~RAL 7016, 92 g). The 1 g weight difference is negligible — it reflects the different paint formulation. Electrically and mechanically, they are the same product in two finishes. If the room uses light-colored switchgear, pick the 5UB1933; if dark-toned, pick the 5UB1923.

Frequently Asked Questions

Does the labeling field add any depth behind the wall?

No. The transparent window and paper slot are integrated into the 55x55 mm cover plate at the surface level. The 5UB1933 fits a standard 45 mm minimum depth flush-mount box, same as the base 5UB1931.

Can I add increased touch protection to this socket later?

No. Increased touch protection is integral to the socket insert and cannot be field-retrofitted. If both labeling and touch protection are required, specify the 5UB1932 (hinged cover + touch protection + labeling field) which bundles all three features.