Product Description:

The HNL05.1R-0040-N0811-N-A4-NNNN is a mains choke manufactured by Bosch Rexroth Indramat for the HNL Mains Chokes series. Installed between regenerative drive inverters and the plant power bus, the unit adds series inductance to smooth line current, reduce dV/dt, and shield upstream components from transient energy returned by servo axes. As an ancillary passive device, it supports stable converter operation in industrial automation lines that cycle between motoring and braking modes.

Its core electrical rating is a 40 µH nominal inductance, which provides the impedance needed to limit harmonic distortion while still permitting full process power flow. The windings carry a 811 A nominal current, so bus-bar terminations and cabinet conductors must be sized for high continuous amperage. During operation, coil copper and core iron release up to 620 W of power dissipation, and that heat must be extracted by forced air because the choke is supplied with an IP00 degree of protection, meaning there is no built-in enclosure. With a mass of 85 kg, mechanical mounting points have to accommodate static weight and shock loads. Design version 1 includes no additional options, and the temperature contact is fitted on one winding in a normally closed configuration.

It operates in ambient air up to 40 °C, after which derating or external cooling is required. The embedded switch is a normally closed temperature contact that opens at 160 °C, allowing the drive controller to trip before insulation damage occurs. For cabinet monitoring, the contact handles control circuits at 250 V AC or 24 V DC with a switching capacity of 1 A, so it should be wired to low-energy protective relays. Because the supply system is regenerative, the choke limits reverse energy without active components and keeps the power path passive.