RL2-521DBB by Bosch Rexroth Indramat

The RL2-521DBB is a motor power cable produced by Bosch Rexroth Indramat within the RL2 Motor Power Cables series. It connects second-generation servo motors to their drives, carrying both motor current and low-level signals in a single routed assembly to simplify cabinet wiring. The product supports Rexroth cable routing standards and belongs to the Rexroth Cable product group, positioning it as a purpose-built component for dynamic machine tools and material-handling axes that demand stable power delivery during constant motion. Using one assembly for power and auxiliary conductors also helps reduce separate cable runs on moving axes.

The mechanical life of the cable is rated for 5,000,000 flex cycles, allowing repeated chain or gantry movement without conductor fatigue. During twisting applications it tolerates a torsional load of ±30 °/m, ensuring signal integrity when rotary axes rotate relative to the cabinet. Dynamic loops must respect a minimum bend radius of 7.5 × D, while static dress-pack runs can be folded to 5 × D; these limits protect the cable during repeated motion. The copper conductors may operate continuously up to +90 °C when clamped, and the power cores are insulated for 600/1000 V, matching common inverter outputs. Insulation resistance remains at least 20 M?/km at 20 °C, preventing leakage currents that could trip differential sensors.

The 1.5 mm² live cores, each with a cross-section of 1.5 mm², are jacketed in PUR (Orange RAL 2003), a material that resists cutting oils and weld spatter while maintaining flexibility through the 2G servo motor speed range. The basic cable design keeps weight low and provides 450/750 V isolation for the embedded control pairs. This cable is well suited for high-cycle linear transfer lines where predictable electrical performance must be maintained across millions of motions.