Product Description:

The PST650E.101-W belongs to the Bosch Rexroth Indramat PST Thyristor Power Units series. As a three-phase thyristor stack, it modulates mains energy so welding transformers, heating zones, or other high-current actuators receive consistent power without mechanical contactors. In automated cells, this electronic switching reduces maintenance intervals and allows cycle-by-cycle current regulation that ties directly into the line controller.

The unit accepts a supply window of 400 V (-20%) to 600 V (+10%), letting one model cover common 400, 480, and 575 V plant networks. A base frequency range of 50/60 Hz means no derating when a facility alternates between European or North American service. During continuous production, it draws a rated line current of 800 A; however, for brief surge periods, the controlled bridge can deliver up to 2,400 A at 10% duty, matching the short-term peaks required by resistance welding guns. At 50% duty, the associated transformer capacity reaches 500 kVA at 50% duty, indicating how much apparent power the downstream magnetic circuit may handle while the junctions remain within thermal limits.

A water-cooled heat sink removes junction heat, allowing installation in cabinets that already carry high ambient temperatures. Line and load cables land on copper bars sized for a cross-section of 240 mm², so conductor heating stays within standard insulation ratings. For supervisory exchange, the front panel hosts a parallel I/O box, and an optional Ethernet slot can be added when PLC communication over TCP/IP is preferred. Timing of weld pulses or heating cycles is handled by an integral 24 V timer circuit that synchronizes firing angles with external triggers. Despite its current capacity, the assembly weighs only 11.2 kg, simplifying drawer-style service removal and reducing structural demands on the enclosure frame.