The 5UB1940 is the entry-level model in the 5UB194x range — DELTA i-system Schuko sockets that include increased touch protection and a labeling field as standard features. Finished in aluminum metallic (~RAL 9006), it provides the core safety and convenience functions without the operating display or overvoltage protection found on higher-tier variants.

What does increased touch protection actually mean?

Increased touch protection (erhöhter Berührungsschutz per VDE 0620) is a passive safety feature: the live contacts are recessed behind insulating plastic shrouds deep inside the socket well. Even if a child inserts a thin metal object into one of the apertures, the object cannot reach the energized contact because the insulating shroud blocks the path. This is always active — there is no mechanism to fail, no spring to fatigue. It is not the same as a child safety shutter (Kinderschutz), which is a mechanical barrier that opens only under simultaneous pressure on both pins. Both increase safety; touch protection does it with geometry, the shutter does it with a spring.

Why choose the 5UB1940 over the 5UB1931 base socket?

The 5UB1931 is the simplest aluminum metallic DELTA i-system socket — no touch protection, no labeling field, no hinged cover. The 5UB1940 adds two practical features: increased touch protection for safer everyday use in homes, schools, and offices, and a labeling field so you can mark circuit numbers without a separate label holder or sticker. At 84g, it is 6g heavier than a basic socket — the extra material is the insulating shrouds inside the contact wells. If you need a clean-looking, safe, identifiable socket without spending on an LED or surge protection you do not need, the 5UB1940 is the right pick.

How do the three aluminum metallic 5UB194x variants compare?

• 5UB1940 (84g): Increased touch protection + labeling field — the straightforward safety-and-labeling pick.
• 5UB1941 (89g): Adds an operating display (LED) that confirms the socket is live — useful in dimly lit installation zones, behind furniture, or in commercial settings where a visible power indicator speeds up fault-finding.
• 5UB1942 (111g): Adds overvoltage protection with a dual-function display — the varistor clamps transient surges and the LED shows both power and protection status. The heaviest because the varistor and its carrier PCB add ~27g.

All three share the same aluminum metallic finish, screwless terminals, 55×55mm insert, 10/16A 250V rating, and IP20 protection. The 1940 is the lightest and simplest — and for many installations, that is exactly what you want.