RKL4591 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat RKL4591 is part of the RKL Motor Power Cables series and features a 29.8 mm outer diameter with a PUR adhesion-free matte jacket in RAL 2003 orange. This cable supports up to 5,000,000 bending cycles and operates at 600 VAC, with power conductor size of 25.0 mm² and control conductor size of 1.5 mm².
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Product Description:
The RKL4591 is a flexible motor power cable produced by Bosch Rexroth Indramat in the RKL Motor Power Cables series. It routes drive power between IndraDrive inverters and servo motors that move machine axes in automated assembly cells, gantries, and material-handling stations. The cable is engineered for continuous-motion applications, maintaining electrical integrity while following energy-chain paths and robot joints.
The mechanical life is rated for 5,000,000 bending cycles, indicating how many chain strokes the cable can endure before conductor fatigue becomes critical. A circular sheath with a diameter of 29.8 mm houses four power cores plus signal pairs, keeping the overall bundle size compact for tight carrier channels. Each phase conductor has a cross-sectional area of 25.0 mm², allowing low voltage drop at typical servo currents, while auxiliary controls use a separate 1.5 mm² pair for brake release or temperature sensing. Copper losses are limited by a power-core resistance of 0.78 Ω/km, helping drives meet efficiency targets and reducing heat accumulation inside closed cable ducts. The cable has a discharge capacitance of 1.1 nF/m, which helps limit inverter-induced common-mode currents. A matte, adhesion-free jacket prevents the cable from sticking to adjacent chains during high-speed motion.
The electrical design supports up to 600 VAC, matching standard IndraDrive motor terminals without additional insulation barriers. Dynamic installations may bend the cable to a minimum radius of 7.5 × D, whereas fixed routing can use a radius of 5 × D when the machine frame provides strain relief. Thermal endurance reaches +90 °C in stationary runs, while flexible segments remain serviceable up to +80 °C for use near warm motor housings and in control cabinets. The outer sheath is molded from PUR, which resists coolants and oils, and it is colored RAL 2003 orange for clear identification inside multi-cable trays. Four cores arranged as 3 + PE deliver balanced three-phase power and provide a dedicated protective grounding conductor for fault clearance.
