Product Description:

The RKL4553 is a motor power cable manufactured by Bosch Rexroth Indramat as part of the RKL Motor Power Cables series. Designed for servo and spindle drives, the cable distributes three-phase power and auxiliary signals between a drive controller and the machine-mounted motor. In automated lines, it carries the required current while the internal control pairs route brake or monitoring signals, reducing the need for separate wiring runs in densely packed machine sections.

At its core, the cable uses a conductor layout of 4x4.0+(2x1.0)+(2x1.5) mm²; the four 4.0 mm² conductors deliver motor phase current, while the smaller wires support auxiliary functions. These power cores are rated for up to 500 V, matching common inverter output levels. Each 4.0 mm² conductor has a resistance of 4.95 Ω/km, which helps limit voltage drop on longer axis runs. The cable has an overall diameter of 17.0 mm, so it fits compact drag-chain channels without taking excessive space. A tough PUR outer jacket resists cutting oils, and its orange RAL 2003 color makes the cable easier to identify on crowded machine frames. The cable is approved for drag-chain operation, and its design accounts for the cyclic torsion loads found in moving cable routes.

During continuous motion, the assembly withstands 5,000,000 bending cycles without conductor failure. In fixed installations, the minimum bend radius is 5 × D, while in moving chains the required radius increases to 7.5 × D to protect the insulation. Internal control pairs carry auxiliary signals at up to 300 V, allowing brake release or thermal sensing through the same cable assembly in compact machine layouts. The core and sheath tolerate conductor temperatures of 90 °C in static routing, so normal enclosure warmth or adjacent motor heat does not accelerate aging.