RKL4439 by Bosch Rexroth Indramat

The RKL4439 motor power cable is manufactured by Bosch Rexroth Indramat within the RKL Motor Power Cables series. It serves as the fixed link between a drive controller and the terminal box of a size-3 servomotor, carrying three-phase power, protective earth, and auxiliary feedback lines for closed-loop automation. The cable is intended for installation in cable trays or drag chains where continuous flexing, oil exposure, and tight bend radii occur. By combining power and signal conductors in one sheath, it reduces cabinet space, simplifies field wiring, and helps keep machine layouts organized. A single cable run can also reduce routing congestion around motors, drive cabinets, and moving machine sections.

The electrical parameters start with a typical capacitance of 1.1 nF/m, which should be considered when planning long cable runs and drive output behavior. Copper conductor resistance is 0.78 ?/km at 20 °C, helping predict voltage drop and thermal loading during operation. Each phase conductor has a cross-section of 25.0 mm², allowing the assembly to support drive systems that operate on 300/500 V power networks. The resulting overall diameter reaches 29.8 mm, which gives the cable substantial mechanical protection while remaining suitable for guided routing. The power core arrangement is 3 + PE, with the protective earth coded GNYE for clear identification during installation.

Four auxiliary cores support sensors or brake circuits, and each control conductor has a cross-section of 1.5 mm² with a 300 V control rating. The outer jacket color is RAL 2003 (Orange), making the cable easy to identify in crowded cable trays and control cabinets. A thermoplastic polyurethane composition labeled PUR resists abrasion and cutting forces during continuous motion. Connection on the motor end is prepared for a terminal box, while the drive end terminates to screw or spring clamps. The cable includes 4 bundled control wires, which allow one-step routing and help limit electromagnetic coupling between separate cable sets.