PST6250.321-L

The PST6250.321-L, Bosch Rexroth Indramat, PST Thyristor Power Units drive controller is a compact two-phase thyristor power unit designed for integration into welding transformer systems. It delivers a nominal system current of 200 A from a 24 V DC to 30 V DC supply in compliance with EN 61131-2 standards, while its built-in control functions eliminate the need for external modules. The unit weighs approximately 12.5 kg and is optimized for vertical or back-facing plate mounting in industrial cabinets up to 2000 m above sea level. An onboard air-blower cooling system maintains operation within its rated performance envelope.

In operation, the PST6250.321-L protects sensitive components with an integrated Metal Oxide Varistor against overvoltage and features an integrated weld timer for precise cycle management. Its 50 % maximum duty cycle is regulated by an internal de-excitation resistor, preventing thyristor overloading during prolonged duty. The drive is housed in an IP20 protection category enclosure and is compatible with standard I/O interfaces, reducing wiring complexity. These specifications ensure stable output under fluctuating mains conditions and deliver reliable performance in high-demand welding processes.

Engineers benefit from the PST6250.321-L’s fully integrated control and monitoring functions, which dramatically simplify system design and minimize cabinet space. The combination of advanced protection features and robust airflow cooling yields exceptional reliability and uptime in harsh industrial environments. Ideal for resistance welding applications, this power unit offers a seamless plug-and-play solution for automated manufacturing systems.