The 5UB1944 is the mid-tier model in the 5UB194x carbon metallic range. It takes the increased touch protection and labeling field of the 5UB1943 and adds a green operating display LED — a small addition that changes how you interact with the socket during installation and troubleshooting.

What does the operating display LED show?

The LED is a presence-of-voltage indicator: green confirms the socket terminals are live, dark means the circuit is dead. It does not show load current — an empty socket still glows green if the wiring is correct. It does not report surge protection status — that requires the dual-function display on the 5UB1945. It is a simple, direct answer to one question: is this socket getting power right now? The LED is powered from the input terminals, so no separate supply or battery is involved.

When is an LED worth having on a socket?

The case is strongest in three situations. Sockets behind furniture or large appliances: when the connected device stops working, a dark LED tells you immediately the socket is dead — you check the breaker, not the appliance. Sockets in rarely-used locations like basements, attics, and storage rooms: the green glow confirms the circuit is alive before you plug in a tool. Multi-socket commercial installations: maintenance staff can scan a row and instantly see which sockets share a live circuit. In a busy kitchen or living room where sockets are always visible and in constant use, the LED adds less practical value — the 5UB1943 without it is the simpler and slightly lighter pick.

How do the three carbon metallic 5UB194x models compare?

• 5UB1943 (85g): Touch protection + labeling — the straightforward essentials.
• 5UB1944 (87g, this model): Adds the LED — the extra 2g is the LED and its carrier PCB.
• 5UB1945 (105g): Adds overvoltage protection and upgrades the display to dual-function — the 20g jump is the varistor and its mounting hardware.

All three share the same carbon metallic finish, increased touch protection, labeling field, screwless terminals, 55×55mm insert, and 10/16A 250V rating. The aluminum metallic equivalents are 5UB1940, 5UB1941, and 5UB1942 respectively.