Product Description:

The HNF05.1A-500N-R0400-N-A4-NNNN mains filter is built by Bosch Rexroth Indramat and belongs to the HNF Mains Filters series, design version 1 within the 05 line. As a line-side component for regenerative drive assemblies, it attenuates high-frequency interference returning to the plant supply and protects adjacent equipment on three-phase networks. By inserting this passive filter between the inverter and the mains, the unit supports industrial electromagnetic compatibility requirements while maintaining stable operation of energy-recuperating drives.

Its enclosure corresponds to protection class IP00, so it must be mounted inside a separate cabinet with adequate shielding. When installed on systems covered by EMC category C3 in accordance with DIN EN 61800-3, the filter suppresses conducted emissions across the fundamental grid spectrum of 50/60 Hz. Reactive behavior is dominated by a leakage capacitance of 500 nF, forming a low-impedance path for high-frequency common-mode currents, while the differential leakage current stays below <905 mA, allowing residual-current devices rated for industrial service. The iron-core inductive network is dimensioned for a continuous nominal current of 400 A, so drives with substantial regeneration can be connected without derating.

Electrical stress across the filter reaches a phase-to-phase nominal voltage of 690/400 V, covering both high-power European installations and lower-voltage auxiliary buses. During steady operation, its internal copper and core losses account for 53 W of dissipation, which should be removed by the cabinet airflow to maintain acceptable winding temperatures. The winding resistance measures only 67 µΩ, limiting additional voltage drop and improving overall system efficiency when large converter groups are paralleled. At 21 kg, the unit is heavy enough to provide mechanical damping while still remaining manageable for panel mounting brackets. The supply system reference states that it is intended exclusively for regenerative devices, so the internal damping network is not overstressed by non-inverting power flows.