Product Description:

The NFD01.1-500-050 is a mains filter manufactured by Bosch Rexroth Indramat for the NFD Mains Filters series. It is mounted between the plant supply and drive controllers to attenuate conducted electromagnetic interference and to establish a low-impedance reference from line to protective earth. This function supports compliance with industrial EMC limits and helps connected inverters maintain stable switching patterns without injecting excess noise back onto the utility grid.

The filter is designed for a nominal line potential of 500 V measured phase-to-phase. Its choke and capacitor network can conduct 44 A continuously when surrounding air does not exceed 45 °C. Because the unit services a three-phase network, all suppression elements are balanced across 3 conductors. Short inrush events are tolerated with an overload capacity of 1.5× Rated Current, which helps prevent nuisance tripping during DC-link charging. Insulation integrity is verified by a line-to-line test of 2125 VDC and a line-to-protective-earth test of 2800 VDC, providing margin against transient overvoltage. These dielectric margins and internal bleeder resistors help maintain the required damping over a wide frequency spectrum.

Incoming power is terminated on screw blocks that accept AWG 6 conductors, and the ground stud carries the same cross-sectional requirement of 10 mm² to keep fault impedance low. The enclosure carries a IP10 degree of protection, so it must be installed inside a closed control cabinet where forced ventilation removes heat generated by copper losses. The current rating applies at a 45 °C ambient, and operation in cooler panels provides additional thermal headroom. With the phase-to-phase voltage reference and symmetric design, residual common-mode voltage at the drive output is minimized, contributing to lower bearing currents and quieter motor operation.