Product Description:

The HLL05.1F-04M0-S0303-N-11-01U2-NNNN bus choke is manufactured by Bosch Rexroth Indramat and belongs to the HLL Bus Chokes series. As a DC-link inductor it is installed between the rectifier and the intermediate circuit capacitors of a drive system; the component filters ripple currents and limits peak inrush energy so that converters and connected servo drives operate with lower electromagnetic interference and reduced component stress. This makes it a passive protective element in high-power automation cells where multiple inverters share a common DC bus.

The choke handles a continuous current of 303 A, matching medium-to-large multi-axis assemblies supplied from a common link at DC 1100 V. Its winding set provides 4 mH of nominal inductance, and the design is current-compensated so differential and common-mode noise are attenuated simultaneously. Thermal losses reach 270 W with air convection; cabinet planners must therefore allocate forced airflow because the unit carries the open-frame IP00 protection grade. A built-in temperature switch rated for 1 A switching current will open the control loop at 250 V AC or 24 V DC, using a normally-closed contact, to signal drive shutdown before critical over-temperature.

Brazed cooling plates allow water circulation; under this mode heat dissipation rises to 480 W with an inlet temperature that may not exceed 60 °C. When winding temperature reaches 160 °C the same switch opens, prompting immediate de-energization. The magnetic circuit exhibits a leakage capacitance of 1.2 µF, a factor considered when meeting EMC limits in installations with sensitive feedback lines. Service staff can lift the assembly with standard handling gear because it weighs 40 kg. Together these thermal, electrical, and mechanical parameters define integration rules for high-power converter cabinets that must comply with continuous duty and fast-trip safety demands.