Product Description:

The HNF01.1A-N1K0-R0650-A-480-NNNN is a three-phase mains filter from Bosch Rexroth Indramat's HNF Mains Filters series. It is installed on the line side of regenerative drive systems. In that position, it suppresses conducted noise and provides a low-impedance return path for energy fed back during motor braking, which helps protect inverters, PLC power supplies, and sensors that share the same industrial power bus. This placement also helps keep switching noise from spreading through shared plant wiring.

The filter accepts a nominal supply of 3 × AC 400–480 V, allowing it to interface with the common low-voltage distribution class used in European and North American plants. A compatible line frequency of 50/60 Hz means no hardware changes are required when equipment is moved between regions. The steel enclosure carries a protection rating of IP20, so live parts are protected against finger contact, but the unit still depends on the surrounding cabinet for full enclosure protection. Conducted emission performance is rated to C3, and compliance is referenced to DIN EN 61800-3. These ratings set the operating range for the surrounding power distribution components and support use in industrial electrical systems.

The allowable line deviation of –15 %/+10 % broadens tolerance for voltage dips or surges that occur when regenerative drives return current to the grid. Because the supply system is specified for regenerative devices only, the filter uses damping elements sized for bidirectional power flow rather than simple one-way loads. Hardware marked as design version 1 and internal series 01 uses consistent mounting dimensions. Its L-C stages moderate inrush, reduce differential-mode noise, and limit peak discharge currents, allowing drive controllers to meet harmonic limits without external chokes or additional R-C snubbers. This behavior helps stabilize the line side during repeated braking and power recovery cycles.