RKL4638 Bosch Rexroth Indramat

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The Bosch Rexroth Indramat RKL4638 is part of the RKL Motor Power Cables series and has a cable construction of 4x35.0 mm² plus 2x(2x1.5 mm²). This power cable features a PUR matt orange jacket, supports 5,000,000 bending cycles, and an outer diameter of 30.8 mm. The bending radius is 5 times the diameter when fixed and 7.5 times the diameter when flexible.

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Product Description:

The RKL4638 motor power cable belongs to the RKL Motor Power Cables series manufactured by Bosch Rexroth Indramat. It delivers three-phase power and auxiliary sensor lines between an Indramat drive and the associated servo motor, guaranteeing stable energy transfer in installations that employ continuous motion of cable chains and robotic axes.

The cable is engineered for up to 5,000,000 dynamic bending cycles, a figure that suits high-duty drag-chain applications. When clamped, it maintains a minimum fixed bending radius of 5 x D, while moving axes may flex the jacket to a tighter 7.5 x D without exceeding insulation strain limits. Core arrangement is specified as 4x35.0 mm² + 2x(2x1.5 mm²), so three power phases, protective earth, and paired control cores travel within one sheath. Copper conductors exhibit a resistance of only 0.554 Ω/km at 20 °C, minimizing I²R losses and voltage drop over extended cable runs.

Connection hardware is standardized: the drive side ships with a RLS0727/K35 angled connector, and the motor end terminates in an RLK0007 plug for rapid field replacement. A distributed capacitance of 1.2 nF/m keeps reactive current low, easing drive filter design, and the overall diameter measures 30.8 mm, allowing it to fit common cable chain cavities. The jacket is PUR with a matte, adhesion-free surface in RAL 2003 orange, resisting oil, abrasion, and weld spatter while remaining highly flexible in industrial environments.

Wake Industrial can arrange same-day shipping on this cable, offers a 1-year warranty with every order, and keeps quotations valid for 30 days to simplify procurement planning.

Bending Cycles
5,000,000
Bending Radius (fixed)
5 x D
Bending Radius (flexible)
7.5 x D
Cable Construction
4x35.0 mm² + 2x(2x1.5 mm²)
Conductor Resistance (20°c)
0.554 Ω/km
Controller Connector
RLS0727/K35
Discharge Capacity
1.2 nF/m
Jacket Color
RAL 2003 (orange)
Jacket Material
PUR (adhesion-free, matt)
Motor Connection
RLK0007
Outer Diameter
30.8 mm

Frequently Asked Questions about RKL4638:

Q: What is the bending cycle rating of the RKL4638 motor power cable?

A: The RKL4638 motor power cable features a bending cycle rating of 5,000,000 cycles, making it suitable for frequent movement applications.

Q: What is the minimum bending radius for the RKL4638 when used in a fixed installation?

A: The minimum bending radius for fixed installation is 5 times the cable diameter.

Q: What is the outer diameter of the RKL4638 power cable from Bosch Rexroth Indramat?

A: The outer diameter of the RKL4638 power cable is 30.8 mm, allowing easy planning for cable management systems.

Q: What type of jacket material is used on the RKL4638 motor power cable?

A: This model uses a PUR jacket material that is adhesion-free and has a matt finish.

Q: Which controller connector is compatible with the RKL4638 motor power cable?

A: The controller connector for the RKL4638 cable is specified as RLS0727/K35.


Internal Product Review

  • ‘‘The RKL4638 is a Bosch Rexroth Indramat RKL series motor power cable designed for demanding motion applications, featuring a robust PUR outer jacket in RAL 2003 orange and specialized cable construction of 4x35.0 mm² plus 2x(2x1.5 mm²). With a rated bending cycle life of 5,000,000 and flexible bending radius of 7.5 x D, this cable ensures reliable performance in dynamic environments.’’

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