RZW02.1-022-015 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat RZW02.1-022-015 is a braking resistor from the RZW Braking Resistors series with a power rating of 22 kW and a resistance of 15 ohms. This resistor weighs 13 kg, features an IP20 protection class, and has dimensions of 490 by 400 by 270 mm.
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Product Description:
The RZW02.1-022-015 braking resistor is produced by Bosch Rexroth Indramat for the RZW Braking Resistors series. As a discrete dissipative element, it converts regenerative energy from drive controllers into heat, preventing DC-bus overvoltage during rapid motor deceleration in automated machines. It is installed inside control cabinets where its electrical and thermal limits accommodate the dynamic braking sequences used by conveyors, gantries, packaging equipment, and other motor-driven machinery. During deceleration, the connected drive directs excess energy to the resistor instead of allowing voltage to continue rising within the DC bus.
The resistor has a resistance of 15 Ω, allowing the drive to transfer up to 22 kW of peak electrical power into the resistor network. The aluminum housing measures 490 × 400 × 270 mm, so the cabinet must provide sufficient installation space and airflow around the cooling fins. Power enters through a pair of terminals sized for 6 mm² conductors, and the connection lugs are clamped by an M10 stud to provide low-impedance contact. The device has an IP20 protection class, which provides protection against finger contact but requires installation inside an enclosure in dusty or wet environments. The resistor has design code 1 and belongs to line 2 within its product series. Its housing transfers generated heat to the surrounding cabinet air during and after each braking event.
For intermittent braking sequences, the resistor uses a load cycle of 120 seconds, consisting of a maximum energization period of 18 seconds followed by at least 102 seconds of cooling. This timing corresponds to an operating factor of 15% and a peak-to-continuous power ratio of 4, allowing short braking pulses without exceeding the element’s permissible core temperature. Heat storage and dissipation follow a thermal time constant of 100 seconds, so the delayed temperature response must be considered when selecting cabinet ventilation. The drive’s calculated minimum braking impedance must remain above 11.6 Ω to prevent excessive current through the resistor. The assembly weighs 13 kg, and its mass must be considered when selecting vertical mounting supports. Adequate clearance around the housing helps heated air move away from the resistor between braking periods.
