RKL4544 by Bosch Rexroth Indramat

The RKL4544 motor power cable is produced by Bosch Rexroth Indramat and belongs to the RKL Motor Power Cables series. In automated production cells, this cable links an inverter to its corresponding servo motor, carrying three-phase power along with control cores so the axis can accelerate, brake, and report faults without additional wiring. Its design supports continuous movement inside cable carriers that track machine slides and rotary tables. Because the power and control conductors share one assembly, the cable can follow moving machine members without requiring a separate trailing bundle for auxiliary functions.

The copper conductors dedicated to the drive phases have a cross-section of 25.0 mm², while the integrated control cores occupy 1.5 mm² each, so power and signal paths remain electrically separated but share one sheath. A circular diameter of 29.8 mm allows routing through standard energy-chain brackets, and the PUR outer jacket in RAL 2003 resists cutting oils and weld spatter. Line losses are limited by a longitudinal resistance of 0.78 ?/km, and pair-to-pair coupling is held to a discharge capacitance of 1.1 nF/m, which helps limit unwanted electrical interaction along the cable length. The material contains no halogens, which limits harmful emissions during a thermal event. That arrangement also supports cleaner routing where machine motion could otherwise expose separate cables to twist or abrasion.

For dynamic applications, the cable is rated for 5,000,000 flex cycles and is suitable for installation in drag chains, so motion does not deteriorate shielding or strand integrity over time. A maximum travel path of 50 m keeps electrical performance within the stated capacitance range when the carriage moves to its furthest stroke. Thermal limits differ between stationary and moving operation: the conductor insulation tolerates up to 90 °C in fixed routing and up to 80 °C when flexing. In moving service, the jacket and conductor insulation are exposed to repeated bending, so the lower temperature limit supports stable flex performance. Frequent reversals and repeated start-stop motion place continuous stress on the sheath, insulation, and shield during normal machine operation.