Perilex

Perilex is the trade name for an approved indoor five-pin three-phase electric power connector system used in Germany, the Netherlands and Sweden.

These oval plugs could get damaged, accidentally or intentionally in order to try reversing the rotation direction of a motor like those with older 3-pin connectors, thus they were considered a peril that needed to be eliminated by a better system.

The Perilex connectors were usually confined to small businesses (e.g. bakeries, restaurants), medical facilities (hospitals, laboratories) and homes, where they had the advantages of smaller form factor and better cleanability.

As electric stoves in kitchens usually remain in use for years at the same place their wires are often connected directly in a junction box without any plug, like tankless water heating.

Furthermore, it is unwise to connect three-phase electrical motors to Perilex sockets due to the aforementioned ambiguity regarding the phase sequence.

pinout of Perilex connectors. When viewing the socket from the front, the assignment is:
PE = centre
N = top left
R (L1) = bottom left
S (L2) = top right
T (L3) = bottom right
16 A Perilex socket
16 A Perilex plug