Product Description:

The RZW02.1-315-006 is a braking resistor assembly manufactured by Bosch Rexroth Indramat and supplied within the RZW Braking Resistors series. In drive systems, it converts surplus regenerative energy from servo or inverter axes into heat so that DC-bus voltage stays within allowable limits and downstream electronics remain protected. This function is especially useful on axes with frequent deceleration, where returned energy would otherwise raise bus voltage during repetitive motion. It uses the line-coded mechanical layout across this range, allowing pairing with Indramat power sections that require external resistor modules.

Its dissipation capacity reaches 315 kW, allowing the device to accept short bursts of regenerated power from multiple axes that share a common DC link. Continuous utilization is limited by an operating factor of 6 % SD, which sets the permissible duty cycle and helps guard the elements against thermal overload. Two resistor strings, each rated at 2 × 2.2 Ω, can be connected, and each internal group presents 2.6 Ω to the bus for staged energy absorption. With a thermal time constant of 100 s, heat stored in the ceramic elements rises and decays in a predictable window that matches most indexing or hoisting profiles. A protection rating of IP20 allows cabinet mounting without additional sealing. Design 1 and electrical line 2 indicate the mechanical and wiring interfaces used for this unit.

The module weighs 93 kg, so cabinet shelves or frames must carry that static load without flex. Overall housing dimensions measure 995 mm in width, 710 mm in height, and 490 mm in depth, and the broad frontal area simplifies airflow routing across the fins. The large enclosure also provides room for resistor spacing that supports heat dissipation during repeated braking events. Power is delivered through a bus bar with a line cross-section of 50 mm², while the dedicated protective conductor uses a 10 mm² cross-section to satisfy grounding requirements for resistor assemblies.