Product Description:

The HNF05.1A-500N-R0320-N-A5-NNNN is a mains filter manufactured by Bosch Rexroth Indramat for the HNF Mains Filters series. It is installed between the supply system and regenerative drive modules to limit conducted electromagnetic interference and improve compatibility with DIN EN 61800-3 EMC categories used in industrial automation. By placing this passive component ahead of drive controllers, high-frequency noise is directed to ground instead of back onto the plant’s three-phase network. This helps nearby sensors, communication lines, and other connected equipment operate more reliably on shared power infrastructure.

This filter is designed for a three-line AC connection and has a nominal line current of 320 A. It can be wired across mixed-voltage networks up to 690/400 V, allowing use on both high-voltage and standard low-voltage bus segments. Internal thermal losses are limited to 36 W, which affects cabinet ventilation when several filters are installed in the same enclosure. Series resistance is only 67 µΩ, so the device adds very little voltage drop during energy recovery. Under worst-case fault or harmonic conditions, leakage current remains within 905 mA, which is important when sizing ground conductors and ground-fault monitoring circuits.

The open-frame housing has a protection rating of IP00, so the filter must be mounted inside a closed control cabinet or similar enclosure. Differential-mode interference is bypassed through a total capacitance of 500 nF, selected to maintain EMC performance without exceeding allowable touch-current limits at the supply frequency of 50/60 Hz. Because the housing is open, energized parts require enclosure-based protection during normal operation. The assembly weighs 21 kg, which should be considered when selecting mounting hardware and panel support. This mass also makes secure fastening important in cabinets exposed to vibration or frequent transport.