RKL4779 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat RKL4779 is part of the RKL Motor Power Cables series and features a core configuration of 4x35 mm² plus 4x1.5 mm². This cable has a PUR jacket in RAL 2003 orange, an outer diameter of 30.8 mm, and supports five million bending cycles. The auxiliary wire cross-section is 1.5 mm², and the conductor resistance at 20 °C is 0.554 Ohm/km.
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Product Description:
The RKL4779 motor power cable is manufactured by Bosch Rexroth Indramat for the RKL Motor Power Cables series. It supplies three-phase power and auxiliary connections from a drive controller to a moving servo or spindle motor in an automation system. The cable is designed for continuous flexing in drag-chain applications, allowing it to maintain consistent electrical performance as machinery accelerates, decelerates, and changes direction. Its flexible construction also supports repetitive travel along gantries, transfer systems, and other moving machine assemblies where fixed cable routing is not practical.
The cable contains a 4 × 35 mm² + 4 × 1.5 mm² core layout that separates the high-current power conductors from the lower-current auxiliary conductors. Each phase uses a 35.0 mm² power conductor to accommodate the large motor currents associated with high-torque axes. Supplementary functions, including motor temperature monitoring and brake control, can use conductors with a 1.5 mm² cross-sectional area. The copper conductors have a DC loop resistance of 0.554 Ω/km, which helps limit voltage drop along extended cable routes. During motion, the cable must maintain a minimum bend radius of 7.5 × D to reduce conductor fatigue as it passes repeatedly through curved sections of an energy chain. The outer PUR sheath resists abrasion and is finished in RAL 2003 orange for clear visibility within machinery.
For fixed routing, the cable permits a minimum bend radius of 5 × D, allowing tighter curves at stationary cabinet, tray, or machine terminations. Its mechanical service life is rated for 5,000,000 bending cycles, making it suitable for production equipment that performs frequent repetitive movements. A distributed capacitance of 1.2 nF/m affects the common-mode displacement current generated by pulse-width-modulated inverter outputs, so this electrical characteristic should be considered when output filters are selected. The round jacket has an outside diameter of 30.8 mm, providing the measurement needed to size cable glands, clamps, carrier dividers, and energy-chain channels. Adequate clearance around the jacket helps prevent compression while allowing the cable to move freely throughout its intended travel path.
