RL2-521CBT by Bosch Rexroth Indramat

The RL2-521CBT is a motor power cable manufactured by Bosch Rexroth Indramat for the RL2 Motor Power Cables series. It functions as the primary power link between Rexroth drive amplifiers and synchronous motors, supporting multi-axis machinery that demands continuous motion and frequent twisting. Built around a torsion-optimized conductor bundle, the cable is intended for routing in drag chains, robot wrists, and articulated axes where electrical integrity must be maintained despite repetitive mechanical stress during industrial automation cycles. Its flexible design supports applications where cable movement is continuous and routing paths change direction repeatedly during operation.

Mechanical service life is rated for <= 5,000,000 bending cycles when the cable follows a dynamic loop with a minimum radius of 7.5×D. This geometry keeps the copper strands below their elastic limit during multi-directional motion sequences. Stationary installations may use a tighter 5×D radius without harming the core insulation. The three-core power group operates on 600/1000 V systems, and each conductor has a cross-section of 1.0 mm², balancing ampacity with flexibility. A molded PUR sheath colored orange (RAL 2003) shields the cable from oils and abrasion, while an overall diameter of 12.2 mm simplifies routing through standard chain separators.

For thermal loading, the copper conductors withstand +90 °C in fixed layout and +80 °C under continuous motion, enabling installation near warm actuators. The dielectric system provides an insulation resistance of >= 20 M?/km, and line-to-shield coupling is limited to 0.4 nF/m, minimizing common-mode currents at inverter switching frequencies. The cable is used as a connection cable for second-generation motors. These electrical properties help maintain drive accuracy and reduce electromagnetic interference over long energy-chain runs.