The Siemens 5UB1537 is a green German Schuko-style (Type F) socket outlet from the DELTA i-system range, featuring an integrated labeling field. Rated at 16 A / 250 V AC with increased touch protection, it fits a standard 55 × 55 mm frame for flush-mount installation. Screwless plug-in terminals keep wiring fast and secure.

What does green signify in German electrical installations?

Green socket outlets are less common than red or orange and carry a broader range of meanings depending on the facility. Common applications include filtered or conditioned power circuits, medical-equipment circuits in healthcare facilities, laboratory power, and dedicated IT or communication equipment circuits. Because the meaning of green is less standardized than red (UPS/safety) or orange (UPS/IT), the integrated labeling field becomes especially important — it lets you spell out exactly what the green circuit feeds, removing ambiguity for maintenance staff and auditors.

Why the labeling field matters more on a green socket

With red and orange sockets, most trained electricians and facility managers recognize the color code immediately. Green does not carry the same universal recognition, so the labeling field does more work on this model. Writing "Filtered Lab Power — Bench 3" or "Medical Grade — Patient Monitor" directly on the socket turns a visually ambiguous color into a precisely documented circuit. Without the label, a future technician has to consult as-built drawings to confirm what the green socket actually powers.