The Siemens 5UB1908 is the DELTA i-system socket outlet with a center protective contact — conforming to the French/Belgian Type E standard (CEE 7/5). Unlike every other socket in this batch, it is not a German Schuko (Type F) socket. The defining difference: a protruding male earth pin in the centre of the socket face, which mates with the corresponding recess in a Type E plug.

What is a center protective contact socket and how is it different from Schuko?

Schuko (Type F, CEE 7/4) sockets use two spring-loaded earth clips on the inner rim of the socket to contact the earth strip on the plug. A Type E socket instead has a fixed round earth pin projecting from the centre of the socket face. This pin enters a recessed earth contact on the plug. The live and neutral pin geometry is identical between both standards, but the earthing method is fundamentally different.

Can I plug a Schuko (Type F) plug into this socket?

Yes — with a qualification. Most modern Schuko plugs have both side earth strips and a recessed earth contact for the centre pin, making them mechanically and electrically compatible with Type E sockets. These hybrid-compatible plugs are sometimes called CEE 7/7. A pure Schuko plug without the centre recess will physically insert but will not make earth contact, leaving the appliance unearthed — a dangerous condition. Always verify plug compatibility before using a Type E socket with Schuko equipment.

Where is the Type E socket standard used?

Type E is the national standard in France, Belgium, Poland, Czech Republic, Slovakia, and several North African countries. If the installation is in one of these countries, or if the equipment being connected uses Type E plugs, the 5UB1908 is the correct socket. For installations in Germany and other Schuko-standard countries, use a Schuko socket from the same DELTA i-system range such as the 5UB1900 or 5UB1907.