HNL01.R-0540-C0094-A-480-NNNN Bosch Rexroth Indramat
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The Bosch Rexroth Indramat HNL01.R-0540-C0094-A-480-NNNN is part of the HNL Mains Chokes series and has a nominal current rating of 94 Amps with a nominal voltage of 480 Volts. This model supports a mains voltage range of 3 x AC 400 to 480 V and operates at 50/60 Hz. It features a nominal inductance of 3 x 540 microhenries, has a protection rating of IP10, and weighs 65 kilograms.
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Product Description:
The HNL01.R-0540-C0094-A-480-NNNN mains choke is produced by Bosch Rexroth Indramat for the HNL Mains Chokes series. Classified as generation 01, the reactor is wired ahead of frequency converters or servo drives to reduce line-current distortion, restrain voltage peaks, and improve the power factor seen by upstream circuit breakers. These functions protect sensitive drive semiconductors and help industrial automation systems meet applicable harmonic limits during continuous operation.
The choke accepts a three-phase input of 3 × AC 400 to 480 V at a utility frequency of 50/60 Hz. Its nominal inductance is 3 × 540 µH, providing the reactance needed to smooth current ripple. When the full-load current of 94 A flows, the resulting voltage drop helps limit line distortion. During current peaks, the inductance remains at least 0.8 × LN to prevent core saturation. The device tolerates mains variations from -15% to +10% around the nominal 480 V line and has an IP10 enclosure rating, so it must be installed in a ventilated cabinet. Power conductors with cross sections up to 70 mm² connect to the main terminals, while a 2.5 mm² conductor pair connects the internal thermal sensor.
During short-duration events, the winding can withstand 235 A without damage. Continuous operation produces approximately 420 W of heat, which must be removed by cabinet airflow. A built-in thermal switch trips at 150 °C, allowing the connected system to isolate the choke before the insulation temperature limit is exceeded. The iron-core assembly weighs 65 kg, so the mounting panel and its supports must accommodate the load securely. When paired with a delta capacitance of 20 µF on the DC link, the choke and its internal inductance form an L-C filter that reduces differential-mode noise and limits inrush current. Adequate terminal clearance should be maintained for the large power conductors, and the thermal sensor wiring should be routed separately from the main current path where practical.
