RKL4521 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat RKL4521 is a motor power cable from the RKL Motor Power Cables series with four power cores of 2.5 mm² and four control wires of 0.75 mm². Designed with a PUR orange outer jacket, it is halogen-free, silicone-free, hydrolysis resistant, and supports up to 5,000,000 bending cycles. The cable features a total shield and operates at a maximum conductor temperature of 80°C.
Internal Product Review
The RKL4521 from the RKL Motor Power Cables series by Bosch Rexroth Indramat is a durable power cable featuring a PUR outer jacket and total shielding for robust mechanical and electromagnetic protection. With 5,000,000 bending cycles and hydrolysis-resistant construction, this cable performs reliably in dynamic industrial environments. Its halogen-free and silicone-free materials make it well-suited for sensitive applications requiring high safety standards.
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Product Description:
The RKL4521 is a motor power cable manufactured by Bosch Rexroth Indramat within the RKL Motor Power Cables series. It is intended for supplying three-phase energy and auxiliary signals between drive controllers and servomotors in automated machinery. The cable combines power transmission and low-level control wiring in one jacket, simplifying routing inside drag chains and robotic axes where continual motion demands high flex endurance.
This model tolerates up to 5,000,000 dynamic bending cycles, making it suitable for long-life energy-chain service. Its round profile measures 14.8 mm in overall diameter, allowing compact installation in densely populated cable trays. Four power conductors, each rated at 2.5 mm², carry motor phase currents, while four control conductors of 0.75 mm² handle brake release or temperature signals. In continuously moving applications the minimum bending radius is 7.5 × D, maintaining conductor integrity during tight loops. A combination foil and braid provides a Total Shield that suppresses electromagnetic interference and supports compliance with drive EMC limits. The jacket also resists abrasion and oil to preserve insulation over repeated motion cycles.
The outer sheath is formed from PUR, a thermoplastic polyurethane chosen for cut resistance and flexibility at low bend radii. Its high-visibility finish is Orange (RAL 2003), aiding differentiation from signal and pneumatic lines in control cabinets. Conductors operate safely up to 80 °C, permitting use near motors or drives that radiate moderate heat. The cable is halogen-free, silicone-free, and hydrolysis resistant, so it will not emit corrosive gases during a fire, avoids silicone contamination in paint shops, and withstands moisture over extended service. For static routing the minimum bend radius is five times the diameter, enabling orderly cabinet wiring without excessive stress on the conductors.
