Product Description:

The HNL05.1R-0094-N1019-N-A4-NNNF is a liquid-cooled mains choke produced by Bosch Rexroth Indramat within the HNL Mains Chokes series. In regenerative drive lines, this component is installed between the supply transformer and the power modules to smooth current peaks and reduce line-side voltage harmonics, helping protect both the drives and upstream grid equipment. Its laminated core and copper windings provide a fixed inductance that limits current rise during energy return from servo inverters and helps reduce electromagnetic interference in high-power systems.

With a nominal current rating of 1019 A, the choke can be used in high-power multi-axis cabinets without forcing the drives into derating. Its winding set presents 94 µH of inductance, which increases impedance against low-frequency ripple generated by regenerative converters. When supplied with deionized cooling water, the choke dissipates up to 3500 W of thermal loss to prevent hot spots during continuous duty. The open construction is classified as IP00, so the unit must be installed inside a switchgear enclosure. A coolant chamber of 4.1 L surrounds the core to support stable heat exchange across the full coil length.

Mechanical integration must account for the choke’s mass of 225 kg, which affects mounting support and cabinet load planning. The hydraulic circuit maintains performance at ambient air temperatures up to 40 °C, and enclosure airflow may need to be improved if surrounding conditions rise above that level. An internal temperature sensor opens an N/C contact when the winding iron reaches 160 °C, allowing the control system to shut down the regenerative supply before insulation is overstressed. At a coolant flow of 9 L/min, the cooling path creates only 0.12 bar of pressure drop, which helps a shared pump loop serve multiple chokes without excessive hydraulic demand.