RHB2-521DCB by Bosch Rexroth Indramat

The RHB2-521DCB is a cable assembly produced by Bosch Rexroth Indramat and assigned to the RHB2 Encoder Cables series. Classified as a Rexroth cable, it is intended for industrial automation layouts that require a single lead that carries drive power and feedback signals between motion controllers and servo motors. This design reduces cabinet wiring, shortens installation time, and helps maintain compact cable routing in machinery that uses encoder-based position control. Because power and feedback travel through one assembly, moving axes can be wired with fewer separate runs through carriers, conduits, or machine frames. This arrangement is especially useful where limited space around the motor makes separate cable routing less practical.

The cable uses a hybrid cable design, meaning both load and signal conductors share the same jacket to reduce connector count. Internally, it uses the conductor pattern 4x L + 2x 0.75 mm² + 4x AWG 24 - DS; the larger cores carry motor current while the smaller conductors transmit encoder data. A total power cross-section of 1.5 mm² supports the current levels found in medium-frame synchronous motors. At the motor end, an M23 Hybrid Connector terminates the conductors, and the quick-locking SPEEDCON system allows fast, secure coupling. Combining these conductors in one outer sheath simplifies routing between the drive cabinet and the motor, and it allows one cable to support both power delivery and position feedback without a second cable run. The cable has a basic construction with a standard PVC jacket and ferrule set without additional EMC accessories.

During continuous motion, the jacket tolerates a dynamic bend radius of 7.5 × D, while static routing may follow a 5 × D radius inside control enclosures. Flex endurance is rated for 5,000,000 bending cycles, which suits cable-track applications with repeated movement. The drive interface is ctrlX DRIVE, and the motor side mates with MS2x with Plug S. These pairings allow direct connection without custom pin reassignment. The stated bend life and interface matching support repeated motion on automated axes where dependable signal transmission and stable power delivery are both required.