RLB3-127LEB by Bosch Rexroth Indramat

The RLB3-127LEB is a motor power cable produced by Bosch Rexroth Indramat within the RLB Motor Power Cables series. Classified under the Rexroth Cables product group, this basic-design power lead forms a direct electrical link between MS2(X) synchronous motors and EFC frequency converters, delivering three-phase power while keeping control wiring separate. That separation allows the power path to remain distinct from signal circuits used elsewhere in the machine. In automated lines, the cable maintains a secure current path during machine motion, allowing the drive to modulate torque without signal loss.

The conductor set uses 4× L + 4× 1.5 mm²; four conductors carry motor power and four 1.5 mm² auxiliary conductors support additional functions. This arrangement places the required power and auxiliary circuits in one cable while keeping the layout easy to route. The phase conductors have a cross-section of 35 mm², which corresponds to 1/0 AWG and helps limit voltage drop at typical servo currents. With a dynamic bending radius of 7.5×D, the cable can be routed through energy chains without overstressing the insulation during repeated motion. It operates from -30 to 80 °C, matching the thermal range commonly required in control cabinets. A direct motor-to-drive connection eliminates junction boxes, and the basic cable construction reduces outer diameter for tighter carrier-track routing.

Mechanical service life reaches 5,000,000 flex cycles, and a static bend radius of 5×D helps protect the copper bundle when the machine is at rest. The motor end terminates with a shielded E (M50) circular connector, providing quick mating to the stator housing. On the inverter side, the pin assignment supports EFC controllers, so the cable connects directly to compatible drives in that family. This interface arrangement keeps the connection path simple for installations that pair MS2(X) motors with EFC converters.