RKL4643 by Bosch Rexroth Indramat

The RKL4643 is a factory-terminated motor supply cable built by Bosch Rexroth Indramat as part of the RKL Motor Power Cables series. It delivers inverter output current to servo or spindle motors in automated production lines, and its preassembled ends allow connection without on-site stripping or crimping. The factory-assembled terminations also help keep contact quality consistent at both ends of the cable, which is useful on machines with repeated service cycles or prefabricated harness layouts. It is suited to machine layouts that need a prepared power connection with repeatable routing and connector geometry. By combining phase conductors and protective grounding in a single sheath, the assembly supports controlled impedance, orderly routing, and electromagnetic compatibility across moving machine axes.

This model is delivered as a ready-made assembly, so its length-specific conductors, shielding, and strain relief are prepared at the factory. The product is identified as a power cable, which means the cores are intended for continuous motor current rather than feedback or control signals, keeping the cable role clear in a multi-cable axis package. Toward the drive end, the conductors terminate in ferrules and ring terminals, which simplify attachment to screw or stud terminals, while the motor end uses a keyed Plug Connector RLS0727 for secure mating with matching receptacles. This connector arrangement supports fast installation and helps maintain a stable electrical connection during machine movement. In dynamic cable chains, the copper bundle may bend repeatedly to a minimum radius of 7.5 × D, which indicates the smallest loop radius recommended during motion.

For high-cycle applications, the sheath and conductor stranding are rated for 5,000,000 flexing cycles, supporting repeated motion where the cable is guided through carriers or routed along moving assemblies. Continuous operation is permitted in ambient temperatures from -30 to +80 °C, so the cable can move through refrigerated areas as well as heated enclosures without requiring a separate low-temperature version. When routed in a fixed position, the cable can follow a tighter bend path of 5 × D, which helps in space-constrained cabinets or junction areas. The same temperature range also applies during storage, so unused assemblies can be kept with standard plant spares. These limits are relevant for both stationary routing and applications with repeated axis travel.