Circular modular pluggable connector

Connector system comprising a first pluggable electrical connector comprising a substantially circular casing and a terminal unit mounted within the casing, the terminal unit comprising a housing with a module receiving cavity formed within the housing, and a plurality of terminal modules insertably received in the module receiving cavity in a stacked arrangement, each terminal module comprising a plurality of contacts, and a mating second connector pluggably connectable and disconnectable to the first connector, the mating second connector comprising a substantially circular casing and a terminal unit mounted within the casing, the terminal unit comprising a housing and a plurality of terminal modules mounted in a stacked arrangement in said housing, each terminal module comprising a plurality of contacts for pluggable connection to a corresponding said plurality of contacts of said first connector, the casings comprising angular alignment members configured to angularly align the casings of the respective first and second connectors with respect to each other, wherein the terminal unit housing of the first connector comprises angular positioning members mating with complementary angular positioning members on the terminal unit housing of the second connector, the angular positioning members and mating angular positioning members configured to allow sliding insertion during plugging connection and to align the terminal units of the mating first and second connectors as they are plugged together, wherein the terminal unit of at least one of the first and second connectors is provided with a slight angular play with respect to the casing allowing an angular rotation in a range between 0.5° and 3° of the terminal unit with respect to the casing.