RKL4473 by Bosch Rexroth Indramat

The RKL4473 power lead from Bosch Rexroth Indramat belongs to the RKL Motor Power Cables series. As an interconnection element between drive controllers and servo motors, the cable transfers three-phase power and auxiliary signals needed for closed-loop motion in automated machinery. Its conductor layout, insulation system, and mechanical construction are selected to handle repetitive motion inside cable tracks while maintaining stable electrical characteristics over the entire service life.

The cable carries a rated line voltage of 600 VAC, distributed through copper conductors with a 6.0 mm² cross-section for each phase. Including protective earth and signal pairs, the design totals 8 conductors arranged around a central filler, yet the overall bundle stays compact with an 18.5 mm outside diameter. Line-to-line capacitance is limited to 0.8 nF/m, a value that helps the connected drive maintain crisp current control at high switching frequencies. Four dedicated power cores accommodate continuous motor current, while the auxiliary pair set of 2 × 1.0 mm² and 2 × 1.5 mm² supplies brake release and temperature sensing functions. A polyurethane sheath colored RAL 2003 (orange) resists cutting oils and spatter often present in machining cells.

For stationary routing, the minimum bend arc is 5 × D, while dynamic chains require 7.5 × D; these limits prevent shield deformation during millions of cycles. The cable supports drag-chain strokes up to 50 m without intermediate supports, aligning with long transfer lines and pallet conveyors. A copper path resistance of 3.30 ?/km keeps voltage drop within drive tolerances on extended runs, so servo torque remains consistent at the motor shaft. Its low-friction sheath also reduces abrasion against guide channels, maintaining insulation integrity throughout repetitive motion.