RZW02.1-018-015 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat RZW02.1-018-015 is part of the RZW Braking Resistors series and has a resistance of 19 ohms with a power rating of 18.5 kW. It features an IP20 protection class, overall dimensions of 490 mm width by 270 mm height by 300 mm depth, and weighs 9.5 kilograms. This braking resistor has a load cycle of 120 seconds with a maximum on-time of 18 seconds and is equipped with an M10 terminal thread.
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Product Description:
The RZW02.1-018-015 braking resistor is manufactured by Bosch Rexroth Indramat and supplied within the RZW Braking Resistors series. Intended for regenerative drive systems, the unit dissipates excess electrical energy as heat when a servo or spindle drive decelerates, preventing DC-bus overvoltage that could trip or damage the inverter. It uses design code 1 in line 2 of the platform, matching the mechanical interfaces used across this product group.
This model can absorb up to 18.5 kW during a braking event. The fixed resistance of 19 Ω sets the DC-link current during regeneration and must be matched to the drive voltage. Thermal loading is limited to a maximum conduction period of 18 seconds per cycle and an operating duty of 15% SD. Aluminum fin elements are connected to a terminal block that accepts 4 mm² supply conductors. An M10 threaded stud provides a low-resistance grounding point. The resistor measures 300 mm deep, 270 mm high, and 490 mm wide, so the installation must provide adequate panel space and airflow around the housing.
During a load cycle of 120 seconds, the resistor requires a minimum off-time of 102 seconds to cool and keep its surface temperature within acceptable limits. Additional modules can be wired in parallel when the drive cannot operate with the nominal resistance, but the connected resistance must remain above the minimum permissible value of 17.5 Ω to prevent excessive current. The housing has an IP20 protection rating, providing protection against finger contact while requiring a cabinet to shield the unit from liquids. A thermal time constant of 100 seconds characterizes the resistor’s heat storage and supports the evaluation of repetitive braking cycles. The assembly has a mass of 9.5 kg and can be mounted on standard backplates without additional reinforcement.
