RKL4579 by Bosch Rexroth Indramat

The RKL4579 is a motor power and control cable produced by Bosch Rexroth Indramat in the RKL Motor Power Cables series. It connects a drive amplifier to the terminal box on a servo motor, delivering three-phase energy while simultaneously carrying auxiliary monitoring signals, so one routed line handles both power and logic. Designed for moving axes in assembly lines and gantry systems, the cable supports repetitive motion without compromising electrical continuity, making it a practical component in automated machinery that relies on coordinated, software-driven positioning.

The power conductors use a cross-section of 16.0 mm², giving ample copper area for low voltage drop at typical servo currents. Separate control pairs each use 1.5 mm² conductors, allowing stable sensor or interlock transmission without the bulk of heavier wiring. Inside the sheath there are 4 individual control cores arranged in two twisted pairs to minimize crosstalk between feedback channels. Control insulation is rated for 600 V AC, matching the overvoltage category of most industrial inverters. For thermal and resistive sizing, the cable's conductor resistance is specified at 1.21 ?/km (20 °C), a figure that helps determine allowable run lengths and fuse protection in multi-axis cells.

Mechanical service life in cable carriers is supported by a minimum bend radius of 7.5 x D, so the assembly can follow tight loops in drag-chain tracks without internal strand damage. The outer sheath is molded from PUR (adhesion-free, matte), a material that resists oils and weld spatter while sliding smoothly along guide channels. Visual identification on busy cable trays is simplified by its color code of RAL 2003 (Orange). An overall diameter of 25.5 mm balances current-carrying capacity with flexibility, and the motor-side termination is prepared for direct landing in a terminal box to simplify installation on large-frame drives.