Phoenix Contact 1313318 The coupler connector has specifications such as PRC 20 color black, and three positions, which accept conductor cross sections ranging from 0.5 mm2 to 2.5 mm2, operating within a voltage range of 400 V and a maximum current capacity of 20 A. Connection is achieved through a screw method with a socket type contact connection, allowing for either manual or tool-assisted release options, catering to DC applications.