Product Description:

The PST6100.326-L is a thyristor power unit built by Bosch Rexroth Indramat within the PST Thyristor Power Units series. It is intended for resistive or inductive load control in industrial automation. The module switches high-current three-phase lines in welding, heating, or transformer-based processes while accepting logic commands from a fieldbus master. By regulating the applied line power, it supports repeatable operation in processes that depend on controlled electrical energy.

During continuous operation, the unit dissipates 70 W of heat, and this loss is removed by an air-cooled path that avoids external liquid plumbing. The unit connects to three-phase mains across a broad window of 400 V -20% to 600 V +10%, synchronized to line frequencies of 50/60 Hz so the firing angle can track utility power throughout the plant. Its thyristor stack is rated for a nominal system current of 130 A, giving enough headroom for dynamic load peaks when operated within the stated duty cycle. Control logic is supplied separately at 24 V DC, within a 19 to 30 V tolerance, and is connected through the INTERBUS I/O link that also handles timer functions.

The assembly has a protection rating of IP20, so it must be installed inside a cabinet but can share airflow with other devices as long as the ambient temperature stays below 55 °C. For higher cyclic power requirements, it can feed transformers up to 76 kVA, and overvoltage transients on the mains are clamped by an internal metal-oxide varistor. Conductors up to 50 mm² can be landed on the terminals, simplifying short, low-impedance connections to busbars. Acceptable storage conditions range from -25 to +70 °C, and the air-cooled design helps keep total weight and space down because no auxiliary pumps or heat exchangers are needed.