PSI6300.333-W2 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat PSI6300.333-W2 is a medium frequency inverter from the PSI Frequency Inverters series. It supports a mains voltage range of 480 to 690 VAC and a nominal system current of 110 Amps. This model features water cooling at 4 liters per minute and has a degree of protection rated at IP20.
Internal Product Review
The PSI6300.333-W2 is a medium frequency inverter with water-cooled operation that supports stable thermal management in demanding applications. Support for 480 - 690 VAC mains voltage and 800 A maximum output current gives the unit strong capability for higher-load installations. IP20 protection and MOV overvoltage protection add valuable electrical and enclosure security.
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Product Description:
The PSI6300.333-W2 medium-frequency inverter is produced by Bosch Rexroth Indramat within the PSI Frequency Inverters series. As a line-powered converter, it conditions three-phase industrial power into adjustable medium-frequency output that feeds induction heaters, melting furnaces, or high-frequency welding equipment. By regulating current and frequency, the unit allows precise matching of thermal profiles or electromagnetic fields to the material being treated while isolating the load from grid fluctuations. The inverter mounts inside a control cabinet and interfaces with plant automation over an INTERBUS timer channel. That interface supports coordinated control signals between the inverter and upstream automation equipment.
The inverter is designed for supply networks between 480 – 690 VAC, so it can be wired directly to common 600 V utility sources. A separate control stage powered from 24 V DC keeps the microprocessor, drivers, and INTERBUS logic active even when the main contactor is open. Internal modulation is managed at a switching clock of 1 kHz, providing adequate resolution for medium-frequency energy transfer without excessive switching loss. During full load, the power bridge can deliver up to 800 A of output current, and the enclosure has a protection rating of IP20 when mounted in a clean electrical room.
Heat removal relies on a water-cooled plate, and service lines with M16×1.5 threads must supply 4 L/min of coolant with an inlet temperature not exceeding 30 °C. The design limits ambient air around the cabinet to 55 °C, and it calls for 100 mm of clearance above and below the housing to maintain airflow for auxiliary components. Cooling efficiency is sized for a maximum loss of 500 W, while steady operation at rated load generates a nominal system current of 110 A. Cabinet loss figures are 100 W at idle and 140 W at maximum power.
