RL2-521DBB Bosch Rexroth Indramat
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The RL2-521DBB is a motor power cable by Bosch Rexroth Indramat, part of the RL2 Motor Power Cables series. It has a cross section of 1.5 mm², a jacket made from orange PUR, and withstands a conductor temperature up to 90°C. This cable is designed for 2nd generation motors, supports 5,000,000 bending cycles, and has power wire rated voltage of 600/1000 V.
Internal Product Review
The RL2-521DBB is a robust motor power cable from Bosch Rexroth Indramat's RL2 series, featuring a basic cable design with a PUR jacket for enhanced durability. Designed for dynamic motion, it withstands up to 5,000,000 bending cycles and supports a maximum torsion of ±30°/m, making it well-suited for demanding automation environments. This cable stands out for its reliable long-term performance in high-flex applications.
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Product Description:
The RL2-521DBB motor power cable is produced by Bosch Rexroth Indramat within the RL2 Motor Power Cables series. In automated machinery, it links second-generation Rexroth servomotors to their drives, carrying three-phase power and auxiliary control signals through moving cable chains and robot joints. The cable belongs to the Rexroth Cable product group, and its flexible PUR jacket enables routing in the tight spaces found in pick-and-place modules, gantries, and packaging equipment.
The cable supports 5,000,000 bending cycles, allowing the conductors to flex repeatedly without metallurgical damage. Rotary motion is accommodated by a torsional limit of ±30 °/m, so the assembly can twist with swivel axes. For dynamic tracks, the minimum bend radius is 7.5 × D, while fixed installations may use a bend radius of 5 × D. The maximum conductor temperature is +90 °C, which helps preserve dielectric strength under full current. Each power core has a cross-sectional area of 1.5 mm², matching the continuous current levels required by small-frame synchronous motors. The cable groups four load conductors with four 0.75 mm² auxiliary conductors and uses concentric stranding to balance mechanical stress throughout repeated movement.
The four power conductors are insulated for 600/1000 V, while the auxiliary conductors are insulated for 450/750 V. An exterior sleeve made of PUR in Orange RAL 2003 resists abrasion, oil, and hydrolysis while maintaining flexibility over long operating cycles. At 20 °C, the insulation system provides a resistance of 20 MΩ/km, limiting leakage current when multiple cables occupy the same drag chain. The combination of separate power and auxiliary conductors allows the cable to carry motor current alongside brake, temperature, or other control signals. Its flexible construction also supports routing between drive cabinets and moving motor axes without placing excessive stress on the internal conductors.
