The invention provides a rotary-wing aircraft rotor fitted with a connector device for connecting electrical power between a hub (1) and blades (2) of said rotor. For each of the blades (2), a wired connection (4) provides an electrical connection between the hub (1) and the blade (2). A guide path (13, 14, 15, 16, 17) holds the wired connection (4) in shape and guides it under tension to move over itself, accompanying the pivoting movement of the blade root (3).