RZW03.1-132-015 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat RZW03.1-132-015 is part of the RZW Braking Resistors series and is rated for 132 kW power with a resistance of 2.7 Ohms and a thermal time constant of 100 seconds. This resistor measures 795 mm in width, 770 mm in height, and 490 mm in depth, and features IP23 protection with a maximum housing surface temperature of 80°C. It has a weight of 86 kilograms and uses a line cross-section of 70 mm².
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Product Description:
The RZW03.1-132-015 is a panel-mounted braking resistor supplied by Bosch Rexroth Indramat within the RZW Braking Resistors series. In an inverter-based axis, the unit converts regenerated electrical energy into heat so the drive can decelerate a motor without causing overvoltage at the DC link. By providing a controlled resistance path, it protects power electronics and connected machinery during the rapid stopping sequences common in automated production. Design code 1 identifies the mechanical layout used for this model. The resistor is intended for cabinet installation beside compatible converters.
The resistor has a continuous dissipation rating of 132 kW, allowing its grid to absorb large braking currents generated by high-power servo axes. The element has a cold resistance of 2.7 Ω, which determines the peak current flowing when the chopper transistor closes and helps the drive keep regenerated energy within safe limits. The duty cycle is limited to 15% SD, so the component can be energized for only a limited portion of each operating cycle to prevent thermal overload. A thermal time constant of 100 s indicates how quickly the housing temperature rises under load. The maximum permitted on-time is 18 s, limiting the duration of each braking event.
The required cooling interval between operating cycles is 102 s, allowing the internal elements to return to a stable temperature before the next pulse. The IP23 protection class guards live parts against finger contact and protects the unit from falling water, but the enclosure still requires indoor placement. Electrical connection uses 70 mm² line conductors and a ground conductor with a minimum cross-sectional area of 10 mm². The housing fastens to a supporting frame through M10 threaded mounting points, which must carry the resistor securely throughout repeated braking cycles. The assembly weighs 86 kg and measures 770 × 795 × 490 mm. During heavy braking, the painted housing can reach a maximum surface temperature of 80 °C, so installation must provide suitable clearance from heat-sensitive components and wiring.
