Product Description:

The HLL05.1F-04M0-S0720-N-11-01U2-NNNN is a bus choke produced by Bosch Rexroth Indramat for the HLL Bus Chokes series. The component is inserted in the DC link of Indramat drive packages where it limits harmonic distortion, filters common-mode noise, and raises the short-circuit impedance seen by the mains. By storing energy in its magnetic core, the choke moderates current transients that arise during regenerative braking or rapid load changes, thereby extending the service life of connected converters and improving overall system stability in industrial automation lines.

The choke is dimensioned for a nominal load of 720 A, while its copper conductors can sustain a continuous current of 556 A without exceeding thermal limits. When tied to a DC-link operating at 1100 V, the inductive reactance cuts peak ripple while keeping energy losses low. For control circuits, the built-in auxiliary contact supports an AC isolation level of 250 V and a DC rating of 24 V, permitting status feedback to safety relays. The switch element carries up to 1 A and is wired as normally closed, so an open signal immediately flags over-temperature or an internal fault. All live parts are formed from aluminum strips that minimize eddy currents and provide low series resistance.

Thermal protection is handled by a bimetal sensor that trips at 160 °C and releases the monitoring contact. The laminated core presents a leakage capacitance of 0.8 µF, keeping common-mode displacement within limits for EMC compliance. Mechanical mounting uses two 11 mm diameter slots that align with a 2 × 11 mm hole pattern on the machine frame, and the structure is current-compensated to counteract magnetic stray fields. Even without an enclosure, the choke satisfies the IP00 category, so installation must occur inside a locked electrical cabinet. Despite a mass of 110 kg, the lift lugs simplify placement with overhead cranes while maintaining center-of-gravity balance during handling.