Product Description:

The NFD02.1-480-130 mains filter is manufactured by Bosch Rexroth Indramat and belongs to the NFD Mains Filters series. This three-phase line component is installed between the public supply and Indramat drive controllers to reduce high-frequency interference and to keep conducted emissions within industrial limits. Its purpose is to protect sensitive servo amplifiers from network disturbances while preventing the drives from injecting noise back onto the mains.

The filter has a rated line current of 130 A, allowing it to serve medium-power inverter groups without saturation. It is specified for three conductors plus a protective ground on networks up to AC 480 V +10%, and all limits apply at an ambient temperature up to 45 °C ambient temperature. Momentary overloads of 1.5 × IN for 1 min/h can be tolerated, providing headroom during motor acceleration or regeneration. During normal operation, the iron-core design dissipates 40 W as heat, so cabinet ventilation must account for this value. The line and load cables connect to copper bars suited for a 50 mm² supply terminal area, while the protective-ground stud accepts conductors of at least 10 mm². Phase symmetry is maintained across its three-phase architecture, and performance verification is carried out at a test temperature of 25 °C.

The dielectric integrity of each pole is confirmed with a withstand voltage of 2125 VDC for 2 s between the lines and the filter housing, while the protective-ground circuit endures 2800 VDC for 2 s without breakdown. Its enclosure carries an IP10 degree of protection, so the device must be mounted inside a closed control cabinet to avoid accidental contact and heavy dust. At only 7.5 kg, the filter can be fastened to back-panel rails or direct plate mounting without special lifting equipment. Grounding is aided by the galvanized baseplate, and balanced impedance across the three phases suppresses both common-mode and differential-mode noise under steady-state loads.