The Siemens 5UB1858-1 is the platinum metallic (silver) variant of the DELTA style surge-protected Schuko socket. It shares the same 68×68 mm format, integrated overvoltage protection, labeling field, and function display as the titanium white 5UB1858 — the only difference is the finish.

What does the integrated overvoltage protection do?

The built-in surge protection circuit clamps transient voltage spikes on the mains supply before they reach connected equipment. It is a supplementary protection stage — it does not replace a Type 1 or Type 2 surge protective device at the distribution board, but adds a last-mile defence at the point of use for sensitive electronics such as computers, AV equipment, or measurement instruments plugged directly into the socket.

How does the DELTA style 68 mm format differ from DELTA i-system?

DELTA style uses a 68×68 mm cover plate and is a distinct design line from DELTA i-system (55×55 mm). The two formats are not interchangeable — frames, centre plates, and inserts from one system do not fit the other. Choose DELTA style when the installation already uses the 68 mm format, or when the larger faceplate and design language are preferred.

When would I choose platinum metallic over the titanium white 5UB1858?

The 5UB1858-1 (platinum metallic / silver) and 5UB1858 (titanium white, similar to RAL 9010) are electrically and functionally identical. The silver metallic finish complements modern commercial and industrial interiors with stainless steel, aluminium, or grey switchgear — while the white variant blends into standard domestic wall finishes. Choose based on the surrounding frame and switch programme colour.