Product Description:

The PST6250.100-W belongs to the PST Thyristor Power Units series produced by Bosch Rexroth Indramat. As a thyristor-based controller, it modulates input power for high-current industrial loads, allowing automated equipment to draw regulated energy throughout each work cycle. This supports repeatable heat or motion profiles while helping protect upstream supply components from sudden current swings. Its control method also allows the connected load to receive power in a measured way instead of being switched abruptly to full conduction.

The unit is designed for a continuous line current of 230 A. Internal dissipation at that load is limited to 110 W, so only a small portion of the incoming power is converted to heat inside the cabinet. A water-cooled heat sink removes that heat, and correct operation of this loop begins at a coolant flow of 4 l/min. The power section is protected to IP20, which provides protection against accidental finger contact with live parts but does not provide water protection. Cabling up to 95 mm² can be connected at the supply terminals to help keep conductor temperature within acceptable limits. A 24 V timer circuit synchronizes firing angles with external control logic, and at a 50% duty cycle the connected transformer can handle 162 kVA during pulsed operation.

The cooling loop can reject up to 420 W during transient peaks, provided the duty cycle does not exceed 50 %. Operation is permitted up to 2000 m altitude, and the complete assembly must be mounted in an IP54 enclosure to limit exposure to airborne moisture and dust. For short high-power bursts, the transformer rating increases to 257 kVA at 20% energization. During this type of operation, the water supply must remain below 30 °C and within 10 bar so the semiconductor junctions stay within their allowable temperature range. These operating limits are important when the unit is installed in enclosed cabinets that handle repeated load changes throughout normal production cycles.