The Siemens 5UB1900 is the green DELTA i-system Schuko socket with increased touch protection. The green SV marking identifies it for safety-relevant or filtered circuits — a colour-coding convention used across German industrial and medical electrical installations.

What does the green SV colour code mean?

In German installation practice, green socket outlets are designated for circuits that require a specific power quality or safety status. Typical applications include IT/server filtered supplies, medical-area socket circuits, and laboratory or test-bench power that must be visually distinguishable from general-purpose mains. The SV marking (Sicherheitsverriegelung / safety interlock) reinforces this designation.

How does increased touch protection work on this socket?

Increased touch protection (erhöhter Berührungsschutz) means the live and neutral contact apertures are internally recessed behind insulating shutters. A standard plug pin must be inserted before the shutters open, preventing accidental contact with a screwdriver, wire, or child's finger. This is a passive mechanical safety feature — no electronics, no moving parts beyond the shutter mechanism itself.

How do the two green DELTA i-system sockets — 5UB1900 and 5UB1910 — differ?

Both are green Schuko sockets in the 55×55 mm DELTA i-system format, but they differ in two important respects:

• 5UB1900: Increased touch protection, conventional screw-type plug-in terminals. The safer choice for publicly accessible areas.
• 5UB1910: No increased touch protection, screwless push-in terminals for faster installation. Rated 10/16 A. The quicker-to-wire choice where touch protection is not mandated.

Choose the 5UB1900 when electrical safety regulations or site policy require increased touch protection on colour-coded sockets. Choose the 5UB1910 when installation speed is the priority and the socket is positioned out of casual reach.