RH2-521DBB by Bosch Rexroth Indramat

The RH2-521DBB cable is produced by Bosch Rexroth Indramat and belongs to the RH2 Encoder Cables series. It serves as a hybrid extension link between drives and motors, carrying power conductors and encoder lines in a single jacket so that motion controllers can exchange energy and position data without separate cable runs. In automated machinery, this arrangement reduces routing complexity through moving sections of the machine and helps maintain stable feedback transmission during repeated flexing in cable chains. The combined layout also keeps the motor connection more compact than separate power and feedback assemblies.

This model is a 2nd Generation design with revised materials and cable geometry. Its mechanical durability is rated for 5,000,000 bending cycles, supporting long service life in applications with constant motion. The copper power cores have a cross-section of 1.5 mm², and they support a continuous effective current of 15.6 A for motor supply. During dynamic movement, the cable may be bent to a minimum radius of 7.5 × D, with D representing the outer diameter. These values set the operating limits for drag-chain routing and help preserve insulation and shield stability during repeated motion.

The molded connector on the motor end uses an M23 Hybrid interface, combining power contacts, signal contacts, and protective earth in one keyed shell. For stationary installation, a bend radius of 5 × D is permitted, which supports tighter fixed routing when the machine is not in motion. The conductor arrangement is [4 x L + (2 x 0.5 mm²)C + (4 x AWG 24)]StC, pairing load conductors with control and shielded feedback lines to reduce electrical noise between circuits. Reliable operation starts at -40 °C and extends to an upper limit of 80 °C, allowing the cable to remain installed in cold storage areas or near warm servo motors. This temperature range supports use in both idle plant conditions and normal machine operation.