RKL4766 by Bosch Rexroth Indramat

The RKL4766 is a flexible motor power cable produced by Bosch Rexroth Indramat for the RKL Motor Power Cables series. It carries three-phase output from drive inverters to synchronous or induction motors in moving machine axes, so it sits between cabinet-mounted drives and servo carriers on gantries, pick-and-place modules, or similar automation equipment. The design focuses on continuous flex duty inside cable tracks where tight bending and high dynamic travel are common. This makes the cable suitable for machines that need one durable run for motor power and related auxiliary circuits while the axis moves repeatedly through the same path.

Its mechanical durability is rated for 5 million bending cycles, supporting long service life in drag-chain routing. When installed in a fixed arrangement, the minimum bend radius is 5 × D, while moving applications require 7.5 × D to reduce conductor fatigue during constant travel. The four current conductors are sized at 6.0 mm² each, and the composite layout 4x6.0 mm²+(2x1.0 mm²)StC+(2x1.5 mm²)StC adds two shielded signal pairs for brake or temperature functions. This mixed construction allows motor power and auxiliary circuits to run in one cable, which helps keep moving harnesses compact. A wear-resistant outer jacket also helps limit abrasion in cable carriers and resists exposure to cutting oils.

Electrical parameters complement the flexible mechanical design. A conductor resistance of 3.30 ?/km keeps resistive losses moderate, while the line's discharge capacitance of 0.8 nF/m remains low enough for stable drive operation on dynamic axes. The cable supports carriage motions up to 5 m/s, matching high-speed linear modules without risking insulation damage during normal use. Its orange jacket improves visual identification in control cabinets and along machine frames, and the surface is made from PUR (adhesion-free, matte) so chips and fluids are less likely to cling to the bundle. The jacket material also supports smooth travel where the cable slides against guides or neighboring cables.