Product Description:

The HNF05.1A-500N-R0250-N-A4-NNNN is a passive mains filter produced for drive systems by Bosch Rexroth Indramat. In an automation cabinet, it is wired between the plant's three-phase supply and regenerative inverters so that conducted high-frequency noise is attenuated before it reaches the line. This placement helps keep switching noise from feeding back into the supply network and nearby electrical equipment. By limiting differential-mode and common-mode interference, the filter helps associated servo and converter drives meet conducted emission limits. Its role is on the line side of the drive system, so braking energy can still flow back toward the grid.

The unit has a protection class of IP00, so all live parts must be installed inside a separate enclosure for touch safety and environmental protection. An external cabinet is therefore required for normal operation. It is rated for a nominal line current of 250 A, which suits high-power multi-axis arrangements without excessive thermal rise in the filter elements. Electromagnetic compatibility is listed under category C3 in accordance with DIN EN 61800-3, which places it in industrial supply networks rather than general residential environments. When power flows in both directions, the filter maintains stable impedance so the regenerative drive can return energy without tripping upstream protection.

The unit belongs to the HNF Mains Filters series, and its internal layout follows series code 05. That code keeps the connection arrangement consistent within this design group. It carries design version 1, which marks the first mechanical and electrical iteration of this layout. The supply entry is intended for regenerative devices only, so the damping and inrush components are arranged for applications that return braking energy to the grid.