RL2-146JBB by Bosch Rexroth Indramat

The RL2-146JBB belongs to the RL2 Motor Power Cables series produced by Bosch Rexroth Indramat. It is a preassembled power lead that links second-generation Indramat servomotors to a C (M50) terminal box connector, supplying three-phase power and protective earth within automated machines. By matching the voltage and insulation demands of modern drives, the cable streamlines installation in gantries, transfer lines, and other motion axes where continuous flexing and torsion are unavoidable during normal machine travel.

The cable endures up to 5,000,000 dynamic bending cycles in drag-chain layouts, showing its expected mechanical service life under repetitive motion. The conductor layout is 4x L + 4x 0.75 mm², which separates the main power cores from the smaller auxiliary conductors for better electromagnetic compatibility. Their combined copper area is 16.0 mm², giving ample current capacity for drives that operate on a rated system voltage of 600/1000 V between phases and ground. A PUR outer jacket protects the cable against oil, coolant, and abrasion while still allowing a minimum static bend radius of 5 × D. The design does not include additional shielding braids, which helps keep the outer diameter to 25.5 mm and reduces cable weight for moving-carrier assemblies.

Thermal limits are 90 °C for fixed routing and 80 °C when the cable is flexing, so cabinet ventilation and routing paths must prevent hotter operating conditions. Leakage capacitance is limited to 0.6 nF/m, which reduces reactive current that could burden frequency inverters at high switching edges. The permissible torsion of ±30° per meter supports rotary tables and robotic wrists without conductor fatigue, and a dynamic bend radius of 7.5×D helps protect insulation during fast strokes. Signal pairs inside the core use a separate 450/750 V rating, which keeps the auxiliary circuits electrically isolated from the power conductors.