RKL4526 by Bosch Rexroth Indramat

Bosch Rexroth Indramat manufactures the RKL4526, a flexible motor power cable that belongs to the RKL Motor Power Cables series. This cable links drive controllers to synchronous or induction motors in automated machinery, carrying three-phase power and protective earth while withstanding the mechanical motion typical of cable tracks and machine axes. It is intended for installations where motors travel on linear axes or moving gantries, so the cable must preserve electrical continuity during constant flexing. Its flexible construction supports repeated movement in automated equipment where the cable must bend regularly during machine travel.

The bulk cable identifier INK0603 is used for the internal layout and insulation system of this model. Inside the sheath, 8 conductors are arranged so the three live phases, neutral, and protective core remain electrically balanced during dynamic bending. Each power core is sized at 4.0 mm², giving a current-carrying capacity suitable for midsized servo drives, and the separate protective conductor has the same cross-section to keep fault-loop impedance low. Copper path resistance is limited to 4.95 ?/km at 20 °C, so voltage drop stays within drive design limits on long machine runs. A discharge capacitance of 0.8 nF/m minimizes reactive current in high-frequency PWM environments and helps reduce stray losses. This balanced arrangement helps the cable maintain predictable electrical behavior when routed through long moving paths.

The outer sheath is made of PUR, an adhesion-free matte compound that resists coolant, oil, and abrasion in moving-cable applications. Its high visibility is provided by the RAL 2003 (orange) color, which matches common safety schemes for power wiring. The matte jacket surface also helps reduce sticking between adjacent cables in drag-chain systems. On the motor end, the molded interface RLK0004 mates directly with Bosch Rexroth servomotors, while the controller side terminates in the circular plug INS0482/C04 for quick cabinet installation. The equal-gauge protective conductor and low-capacitance cable design support stable power transmission during continuous motion.