Ahh yes, 56 series...
Give me Ceeform by choice, but they work well enough.
Just be careful - the neutral pin is undersized relative to the actives in the 5 pin variants - designed for industrail applications and such where there aren't the harmonics and other garbage we create at times that dump excessive loads down the neutral.
For our northern friends - the 56 series incorporates a vast range of connectors, all of which are rated to IP56, but the term is most comonly used for a 5 pin connector used for 3 phase applications. The pins are arranged with a central pin, the neutral and 4 pins at 12, 3, 6, and 9 o'clock, Earth at the bottom and then the 3 phases in the other positions. A 4 pin variety exists which omits the neutral. The 4 pin plug mates with the 5 pin socket, but not vice versa, so when an outlet has been installed to power a motor or the like and is only a 4 pin socket to save the cost of installing the neutral, then you're out of luck for single phase loads via a PD or dimmer.
Connecting cable is normally a 6mm2 5 core flexible cable.
Remember to check the normal gotchas - current rating of the outlet, plug and intervening extension.
The only thing worse than trying to plug a 40A plug into a 32A outlet is a 32 into a 20, becuase then you can't just file down the keying...
Within the three phase connectors, there are 2 physical sizes, the smaller having ratings of 10, 15 or 20A, and the larger of 32, 40 or 50A. Within each physical size, a plug of a lesser current capacity can makte with a socket of a greater capacity, but not the reverse, so a 10A can plug into a 10A socket, a 15A socket or a 20A socket, but not a 32, 40 or 50. Likewise a 20A plug can only be connected to a 20A socket.
Within each physical size, the pins are the same size and configuration, plastic keying on the shell is used to prevent higher capacity plugs being inserted into lower capacity sockets.. Although not code compliant, these keys can be removed fairly easily with a file or grinding tool to get one out of a difficult situatiion, and encountering the evidence of this is not uncommon.
And remember the OH&S aspects of a 50m 32A 3 phase - those suckers are heavy.
