RH2-021DBB by Bosch Rexroth Indramat

The RH2-021DBB is an encoder cable assembly supplied by Bosch Rexroth Indramat within the RH2 Encoder Cables series. Intended for servo feedback loops, the hybrid cable links motor-mounted encoder heads to drive controllers so that positional data and drive power share the same harness. By consolidating feedback and power conductors, the cable reduces cabinet wiring density and shortens installation time in automated production cells. The assembly is identified by part number RH2-021DBB, which distinguishes its dimensional and electrical characteristics from other harness lengths in the same family.

The connection hardware uses an M23-Hybrid plug, so both encoder cores and motor phase leads terminate in a single circular connector. Internally, the conductors follow the cabling code [4x L + (2x 0.5 mm²)C + (4x AWG 24)]StC, giving four load lines, two control cores, and four shielded signal pairs in one sheath. Each load line has a cross-section of 1.5 mm², which supports current flow for medium-frame synchronous motors. A jacket made of PUR resists cutting oils while keeping the overall diameter to 13.0 mm. Power conductors are insulated for up to 600/1000 V, allowing the cable to carry motor power together with auxiliary circuits in the same assembly.

The cable is suited for moving-axis tracking systems because it combines thermal capacity with flexible motion performance. The copper cores withstand continuous operation at 90 °C in fixed installations and up to 80 °C in flexing drag-chain applications. A torsional limit of ±30°/m allows the harness to twist with robot wrists without excessive conductor stress. Signal pairs are insulated for 450/750 V, which helps limit interference when they run beside higher-current conductors. The outer sleeve is Orange (RAL 2003), making the cable easy to identify during installation and service.