The 5UB1945 is the flagship of the carbon metallic 5UB194x range — the only socket that layers varistor-based overvoltage protection on top of increased touch protection, with a dual-function display and labeling field. At 105g, it is the most feature-dense carbon metallic Schuko socket in the DELTA i-system catalog.

How does the 5UB1945 compare to the 5UB1926?

The 5UB1926 is the carbon metallic socket with overvoltage protection, function display, and labeling field — but no increased touch protection. The 5UB1945 adds the passive contact shrouding that the 5UB1926 omits. The trade-off is weight and cost: the 5UB1945 at 105g is 10g lighter than the 5UB1926 (115g) — an interesting data point that suggests the 5UB1945 uses a revised internal layout despite carrying one extra feature. Electrically, both use the same varistor-based surge clamping and both report protection status via a front-facing display. Choose the 5UB1945 if you want touch protection with your surge suppression; choose the 5UB1926 if touch protection is not needed and the simpler contact geometry is preferred.

What does the dual-function display report?

Two independent conditions. Green confirms the socket has mains voltage — same as the single-state LED on the 5UB1944. The second condition is protection status: if the display goes dark on a known-live circuit, the varistor has reached end of life. Varistors degrade incrementally — each surge event consumes a small portion of the metal-oxide material. When the degradation crosses the failure threshold, the protection element can no longer clamp surges. Crucially, the socket continues delivering power — the varistor is wired in parallel with the output, not in series. A dark display on a live circuit means replace the insert to restore surge protection. This dual-state reporting is what distinguishes the 5UB1945's display from the simple power-on LED on the 5UB1944.

Where does point-of-use surge protection fit in a building's protection scheme?

Per IEC 60364-5-53, surge protection is layered. Type 2 SPDs in the distribution panel absorb the bulk of a surge event. Type 3 devices at the socket — like the varistor in the 5UB1945 — clamp the residual energy that the upstream SPD did not fully suppress. The socket does not replace panel-level protection; it complements it. For sensitive single-phase loads — computers, AV receivers, network equipment, home automation controllers — having both layers means the equipment sees only the clamped residual, not the full attenuated surge. The socket is the last meter of defense.