RKH0904 by Bosch Rexroth Indramat

The RKH0904 cable assembly is produced by Bosch Rexroth Indramat as part of the RKH Hybrid Cables series. It routes motor power, encoder feedback, and protective earth through a single sheath, forming a ready-to-install link between a servo drive and its moving actuator. This consolidated routing keeps power, feedback, and grounding paths in one managed cable run between the drive cabinet and the motor. By replacing multiple separate leads, the hybrid layout reduces cabinet bulk and eases installation inside energy-guiding chains, which is useful in pick-and-place units, gantry axes, and articulated robots that flex repeatedly during each shift.

The cable is supplied as a ready-made assembly, so factory-crimped contacts and overmolded backshells remove on-site termination errors. At the motor end, it uses an RHS2321 angled connector with a quarter-turn lock for secure attachment. The angled form also helps cable routing where machine clearances are limited near the actuator. The jacket supports a minimum dynamic bend radius of 10 × D, which means the cable should not bend tighter than ten times its outer diameter while the machine is moving. A Basic design classification indicates a standard polyurethane outer jacket without liquid-cooling channels, helping keep overall diameter and weight low for high-speed travel in horizontal or vertical cable tracks.

For long service life under constant motion, the assembly is rated for 5,000,000 bending cycles before conductor fatigue becomes critical. Its hybrid cable construction combines copper power cores with smaller signal pairs, helping limit crosstalk by keeping conductor geometry stable through each flex. On the control-cabinet side, a compact RHS0011 straight plug mates with compatible drive modules while keeping connector depth to a minimum behind the panel. This low-profile cabinet connection is helpful where drive modules are mounted close together. When the machine is parked or wired statically, the sheath can be routed to a minimum stationary radius of 5 × D, allowing tighter placement behind panels without exceeding mechanical stress limits.