RKL4421 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat RKL4421 is a motor power cable from the RKL Motor Power Cables series. It features a 4x2.5 mm² plus 2x(2x1.0 mm²) stranded conductor construction and supports up to 5,000,000 bending cycles, making it suitable for drag chain applications. This cable is halogen-free, features a PUR matte orange jacket, and has a typical capacitance of 0.7 nF per meter.
Internal Product Review
The RKL4421 is a flexible power cable from the RKL series, designed for use in dynamic drag chain applications with up to 5,000,000 bending cycles. The PUR jacket is halogen-free and offers reliable protection, making this cable well-suited for demanding industrial environments. An overall shield and dual control wire pairs further enhance signal integrity and operational stability.
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Product Description:
The RKL4421 motor power cable is supplied by Bosch Rexroth Indramat within the RKL Motor Power Cables series. It routes three-phase power and paired control signals between an Indramat drive and a synchronous servo motor while withstanding continuous flexing inside automated machinery. The cable is approved for drag-chain use, allowing it to maintain its bend radius and service life when installed in reciprocating carriers.
The jacket withstands up to 5,000,000 bending cycles, helping the conductors maintain insulation integrity during rapid axis motion. A composite core with a layout of 4x2.5 mm² + 2x(2x1.0 mm²) StC separates the power conductors from the signal pairs, reducing crosstalk when the drive switches at high carrier frequencies. Line-to-shield capacitance is limited to 0.7 nF/m, which reduces reactive current and keeps inverter losses low on long cable runs. The copper conductors have a DC resistance of 7.98 Ω/km at 20 °C, providing the information needed to calculate voltage drop and motor torque margins. Each feedback or brake channel has a 1.0 mm² cross-sectional area that accommodates typical control-circuit current levels. An outer sheath made of PUR resists cutting oils and remains adhesion-free, allowing the cable to move smoothly through guide channels without sticking.
The RAL 2003 orange jacket improves visibility in crowded cable trays and helps distinguish the cable from nearby wiring. The dedicated phase conductors have a 2.5 mm² cross-sectional area, providing sufficient current capacity for medium-frame Indramat servo motors while fitting standard clamp terminals. A total shield made of tinned-copper braid surrounds all cable elements, directing electromagnetic interference to ground and protecting control signals from drive-side switching noise. Two twisted control pairs support separate brake or temperature channels, while the halogen-free materials minimize the release of corrosive gases during an electrical fault.
