RL2-045FBB by Bosch Rexroth Indramat

The RL2-045FBB is a motor power cable produced by Bosch Rexroth Indramat for the RL2 Motor Power Cables series. It carries three-phase power and control signals between a second-generation Rexroth servo motor and its drive, letting automated axes move while the cable follows continuous machine motion. This part is intended for cable chains or robot arms where long flex life and torsion tolerance are important.

The cable is rated for 5,000,000 bending cycles, so it remains electrically stable during long service in dynamic tracks. A maximum torsion of ±30°/m lets it twist around vertical robot joints without conductor fatigue. When installed in moving runs, the flexible minimum bend radius of 7.5 x D protects the insulation from kinking, while fixed routing may use 5 x D. Copper strands can reach a continuous conductor temperature of +90 °C in static routing and +80 °C during motion, which supports operation in hot machining cells. The power cores withstand 600/1000 V, matching common drive bus voltages, and the overall diameter of 17.0 mm fits standard chain separators. Four power conductors of 4 x 4.0 mm² carry the main phase current, and four 0.75 mm² signal cores allow temperature or brake feedback. Two auxiliary pairs of 1.0 mm² provide additional brake or sensor circuits. The basic cable design keeps weight down, and the PUR jacket resists oils and coolants.

The leakage capacitance is limited to 0.5 nF/m, which reduces reactive current and supports longer motor leads without derating. Control cores are insulated for 450/750 V, separating brake or other control voltages from the power lines. A tough PUR sheath maintains flexibility at low temperatures and withstands chips during repeated motion. The 4.0 mm² conductor cross section supports motor power transmission in high-duty servo applications.