Product Description:

The RZW02.1-132-040 is a panel-mounted braking resistor manufactured by Bosch Rexroth Indramat for the RZW Braking Resistors series. In drive systems using regenerative AC servo or inverter modules, the unit converts excess kinetic energy into heat so the DC bus voltage stays within safe limits during deceleration or load reversals. The unit is a type C7 resistor without active switching components and is intended for indoor enclosures that rely on natural convection.

The resistor has a continuous absorption capability of 132 kW and a nominal resistance of 2.3 Ω, which determine the braking current that the connected inverter can safely divert. An operating factor of 40% SD limits power application within the 120-second load cycle, preventing thermal saturation. The permissible energized period is 48 seconds, followed by a required 72-second idle period that allows the internal temperature to decrease. If additional units are wired in parallel, the aggregate resistance must not drop below the specified minimum of 2.2 Ω. All live components are protected by an IP20 enclosure, which prevents accidental contact while permitting airflow through the unit.

The resistor has a thermal time constant of 100 seconds, indicating the interval required for a 63% rise toward the steady-state temperature after a load step. Under these conditions, the surface temperature must remain below 80 °C to prevent heat damage to adjacent wiring and other cabinet components. The cabinet-style frame is 960 mm high, 995 mm wide, and 490 mm deep, so the enclosure must provide adequate mounting space and clearance for unrestricted convection. The unit has a mass of 126 kg, making rigid structural support or suitable floor brackets necessary for secure installation. The component belongs to Line 2 and Design 1 of the product series. Its mounting position must allow heat to rise away from the housing without being trapped by nearby equipment, cable bundles, or enclosure panels.