HLL05.1F-500U-G0320-N-D7-NNNN-NNNN Bosch Rexroth Indramat
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The Bosch Rexroth Indramat HLL05.1F-500U-G0320-N-D7-NNNN-NNNN is part of the HLL Bus Chokes series and uses a liquid-cooled system. This bus choke has a voltage class of DC 750 V, weighs 39 kg, and offers IP00 protection. It features a temperature switch triggered at 160 °C with a normally closed contact, rated for AC 250 V and DC 24 V.
Internal Product Review
The HLL05.1F-500U-G0320-N-D7-NNNN-NNNN is a bus choke engineered for DC 750 V systems with efficient liquid-cooled operation. An N/C temperature switch with a 160 °C trigger adds dependable thermal monitoring, supporting reliable bus conditioning in demanding installations.
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Product Description:
The HLL05.1F-500U-G0320-N-D7-NNNN-NNNN bus choke is produced by Bosch Rexroth Indramat for the HLL Bus Chokes series. As a DC-link inductor, the unit is installed between the rectifier and the intermediate circuit of an inverter to smooth current peaks, attenuate harmonic distortion, and protect drive electronics from transient overvoltage. By keeping DC-bus ripple low, it helps motion controllers and servo inverters maintain stable torque while reducing electrical stress on capacitors. The choke is suitable for industrial automation systems that include multi-axis machines, conveyors, and processing equipment.
The choke core is installed in a liquid-cooled housing, allowing heat generated by copper losses to be carried away by a coolant loop instead of ambient air. This cooling method permits continuous operation when the unit is mounted inside a sealed cabinet with adequate coolant circulation. Its terminals support a DC-link rating of 750 V DC, which is the highest continuous operating voltage permitted across the inductor. With an IP00 classification, the device must be installed inside an enclosure that provides protection against contact with exposed components. The integrated temperature contact supports control circuits up to 250 V AC, enabling direct wiring to compatible protective relays. The unit has a mass of 39 kg, which must be considered when selecting mounting hardware and reinforcing the installation panel.
A second temperature-monitoring path supports low-energy control circuits operating at up to 24 V DC. The thermal switch changes state at 160 °C, indicating that the winding temperature has reached its maximum permitted limit and allowing the drive to initiate a protective shutdown. The switch has a normally closed (N/C) contact, so electrical continuity is present during normal operation and the circuit opens if an overtemperature condition occurs. This operating method also allows an open wire or disconnected sensor circuit to trigger a fault response. The temperature circuit can therefore be connected to a drive input or protective relay that monitors continuity during operation.
