RKL4520 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat RKL4520 is part of the RKL Motor Power Cables series and is designed for use at ambient temperatures from -30 to 40°C for fixed installations and -20 to 40°C for flexible setups. This cable has a conductor resistance of 1.21 ohms per kilometer at 20°C, features a PUR jacket in RAL 2003 orange, and supports up to 5,000,000 bending cycles. Its outer diameter measures 25.5 mm.
Internal Product Review
The RKL4520 motor power cable from Bosch Rexroth Indramat features a durable PUR jacket in RAL 2003 orange for high visibility and protection in industrial environments. It supports up to 5,000,000 bending cycles and maintains flexibility with a dynamic bending radius of 7.5xD. This cable stands out for robust construction and long service life in demanding applications.
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Product Description:
The RKL4520 motor power cable is produced by Bosch Rexroth Indramat and belongs to the RKL Motor Power Cables series. Designed to connect Rexroth servo drives to compatible motors, it carries three-phase power and auxiliary control signals within a single jacket. The cable uses PUR insulation that resists oil and abrasion, while its orange RAL 2003 finish makes the harness easy to identify within machinery. By combining power and brake conductors in one preassembled harness, the cable reduces the number of separate connections required for automated axes and helps simplify routing through equipment.
The main phase conductors each have a cross-sectional area of 16.0 mm², while the integrated control pairs have a cross-sectional area of 1.5 mm². These conductor sizes support the required current flow while helping control voltage drop across longer cable runs. Copper resistance at 20 °C is rated at 1.21 Ω/km, allowing electrical losses to be considered when matching the cable to the drive and motor. An overall diameter of 25.5 mm keeps the cable compact enough to fit within standard drag-chain channels and routing guides. During machine movement, the minimum dynamic bending radius is 7.5 × D, which limits mechanical stress on the conductor strands as the cable repeatedly flexes. The matte, adhesion-free jacket also prevents sticking against adjacent cables or carrier surfaces during continuous movement.
For fixed routing, the assembly operates at ambient temperatures from -30 to +40 °C, making it suitable for control cabinets and stationary machine sections exposed to a broad temperature range. In moving cable carriers, it remains functional from -20 to +40 °C, where repeated motion places additional demands on the jacket and internal conductors. Cyclic durability reaches 5,000,000 bending cycles when the recommended motion conditions are maintained. A stationary installation permits a minimum bending radius of 5 × D, allowing tighter turns in control cabinets without kinking or damaging the conductor cores. The controller end terminates in a keyed RLS0723/K16 connector, which provides polarity-safe mating with compatible Rexroth drive modules and helps prevent incorrect orientation during connection.
