Electrical connector arrangement for the distribution of different levels of power to a printed circuit board

A modular connector assembly for the distribution of power to a printed circuit board comprising several pairs of matable individual connector modules (11,11'; 12,12'; 13,13') having different power carrying capacities. A first connector module (11,12,13) of each pair has a pluggable mating face (18) located transversely of a board engaging face (17) and a second connector module (11',12',13') of each pair has a complementary pluggable mating face (21) located opposite a board engaging face (19), all board engaging faces (17,19) having the same common dimensions. Individual first and second modules (11,12,13 and 11',12',13') are provided with latch members (25,26) engageable by relative rotation of selected adjoining modules, to link all first modules (11,12,13) together and all second modules (11',12',13') together to form composite connector bodies mountable in rows along one edge of a daughter board and on a mother board, and with matable modules (11,11'; 12,12'; 13',13') of respective pairs in corresponding positions, whereby the daughter board (33) can simply be plugged to and unplugged from the mother board (34') to connect and disconnect different selectable power levels between the boards (33,34'). High current carrying terminals (60,100) of the modules have contact posts (70,108,106,104) at different spacings and lengths from a contact point to assure equal resistivity to avoid hot spots. A polarising key locking feature is provided on an end module (30,30' and 230,232) by a snap ring which permits engagement and disengagement by a simple tool.