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RL2-521CBB Bosch Rexroth Indramat

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The Bosch Rexroth Indramat RL2-521CBB is a motor power cable from the RL2 Motor Power Cables series. It features 4 power and 4 auxiliary conductors, supports a rated voltage of 600/1000 V for power and 450/750 V for signals, and has a cross section of 1.0 mm². The cable has a maximum operating temperature of 80°C when fixed, an outer diameter of 12.0 mm, and is designed for the second generation of motors.

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Product Description:

The RL2-521CBB motor power cable is supplied by Bosch Rexroth Indramat within the RL2 Motor Power Cables series. It links second-generation Rexroth servo motors to their drives, transmitting three-phase power and auxiliary signals through a single bundled cable. This arrangement reduces the number of separate cable runs and supports orderly routing in industrial automation cells with frequently moving axes.

The cable contains four unshielded power cores and four signal conductors in a 4 × 1.0 mm² + 4 × 0.75 mm² layout. The power conductors have a cross-sectional area of 1.0 mm², allowing continuous operation at the cable’s rated current. An overall diameter of 12.0 mm must be considered when selecting cable trays, carrier partitions, clamps, and entry glands. The power conductors are insulated for systems rated at 600/1000 V, making the cable suitable for standard machine-tool power circuits. Fixed installations require a minimum bend radius of 5 × D, while dynamic drag-chain routes require a minimum bend radius of 7.5 × D to limit conductor fatigue. The cable’s four auxiliary conductors can carry distributed input and output signals, brake power, or sensor supply without requiring an additional harness.

The signal circuits support voltages up to 450/750 V, and capacitive coupling is limited to 0.4 nF/m to reduce unwanted interaction with drive-side filtering. In fixed installations, the cable withstands ambient temperatures up to +80 °C, while moving applications should remain at or below +60 °C. The cable can be stored at temperatures as low as −30 °C and operated at temperatures down to −20 °C without jacket embrittlement. Torsional movement of ±30 °/m allows the cable to accommodate controlled twisting in rotary tables or robotic wrists. The Basic design uses a PVC outer sheath that provides oil resistance and flexibility for production machinery. Its unshielded arrangement should be routed with suitable separation from noise-sensitive signal cables to help preserve reliable operation.

Auxiliary Conductors
4
Bending Radius (fixed)
5 x D
Bending Radius (flexible)
7.5 x D
Cable Design
Basic
Cable Type
4x L + 4x 0.75 mm²
Cross Section
1.0 mm²
Leakage Capacitance
0.4 nF/m
Max Temp (fixed)
+80 °C
Max Temp (flexible)
+60 °C
Min Temp (fixed)
-30 °C
Min Temp (flexible)
-20 °C
Motor Generation
2nd
Outer Diameter
12.0 mm
Power Conductors
4
Product Group
Rexroth Cable
Rated Voltage (power)
600/1000 V
Rated Voltage (signal)
450/750 V
Torsion
±30 °/m

Frequently Asked Questions about RL2-521CBB:

Q: What is the outer diameter of the RL2-521CBB motor power cable?

A: The RL2-521CBB cable has an outer diameter of 12.0 mm, providing a compact yet durable form factor.

Q: How many auxiliary conductors are included in the RL2-521CBB cable?

A: This cable is equipped with 4 auxiliary conductors to support additional functions beyond power transmission.

Q: What is the rated power voltage for the RL2-521CBB cable from Bosch Rexroth Indramat?

A: The RL2-521CBB features a rated voltage of 600/1000 V for power applications.

Q: What is the minimum bending radius for flexible use of the RL2-521CBB cable?

A: For flexible installations, the minimum bending radius is specified as 7.5 times the cable diameter.

Q: What is the maximum operating temperature for the RL2-521CBB cable in fixed and flexible installations?

A: The RL2-521CBB cable can operate in temperatures up to +80 °C when fixed, and up to +60 °C when flexible.


Internal Product Review

  • ‘‘The RL2-521CBB from Bosch Rexroth Indramat is a robust RL2 Motor Power Cable featuring 4 power conductors and 4 auxiliary conductors, designed for reliable performance with 2nd generation motors. Its rated voltage of 600/1000 V for power and a cross section of 1.0 mm² provide dependable power transmission. This cable stands out for its versatility in demanding industrial environments.’’

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