Phoenix Contact 1313293 The Coupler connector is part of the PRC 20 range and has a black color. It can accommodate up to two positions and accepts conductors with cross-sections ranging from 0.5 mm² to 2.5 mm². The rated voltage and current are 400 V and 20 A, respectively. Connection is made via screw connection with a socket contact type and features a release setting option that can be activated either manually using a tool or by hand, catering to the BUS scope.