Product Description:

The RZW02.1-160-040 braking resistor is produced by Bosch Rexroth Indramat as part of the RZW Braking Resistors series. Installed on the DC link of a drive, it converts excess electrical energy into heat whenever a motor regenerates, preventing overvoltage events in automated machinery. The unit follows Design 1, carries the auxiliary function code W1, and belongs to Line 2 of the platform. These design attributes correspond to the mechanical outline and mounting accessories selected for this resistor group.

This unit is rated for 160 kW of continuous dissipation when operated as one resistor group. The operating factor of 40% SD is paired with a load cycle of 120 seconds. During each cycle, the resistor may conduct for a maximum of 48 seconds before requiring at least 72 seconds of cooling. The minimum connectable resistance is 2.2 Ω, so the drive must keep the DC-bus voltage and peak current within the permitted limits at that resistance. A peak-to-continuous power ratio of 2.2 indicates the short-term overload capability available during fast deceleration. The resistor elements use a parallel connection, allowing regenerative current to be distributed between them.

Copper supply conductors with a cross-sectional area of 95 mm² are required to carry the permissible current. The housing has an IP20 protection rating, so the resistor must be mounted inside a control cabinet with suitable airflow and protection from moisture. Its open enclosure prevents accidental contact with large internal parts but does not protect the assembly from water. A thermal time constant of 100 seconds indicates how long the assembly takes to reach approximately 63% of its final temperature after a load step, which supports thermal load calculations. The internal layout uses a 2 × C3 configuration, with each individual element providing 5.4 Ω of resistance. Because the elements are connected in parallel, the DC link sees their combined effective resistance rather than the resistance of either element alone.