PST6250.105-L Bosch Rexroth Indramat
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MPN: 1070086440
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The Bosch Rexroth Indramat PST6250.105-L is part of the PST Thyristor Power Units series and operates on a control supply of 24 V DC with an input voltage range of 400 V to 600 V. This air cooled, 2-phase AC unit features a maximum transformer power of 250 kVA and can handle a system current of 200 Amps. The protection class is IP20 and the unit functions at input frequencies of 50 or 60 Hz.
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Product Description:
The PST6250.105-L thyristor power unit is produced by Bosch Rexroth Indramat as part of the PST Thyristor Power Units series. In an automated welding or heating cell, the device is installed between the mains supply and a transformer, switching current through controlled silicon phase angles so that secondary energy is delivered in precise portions. This allows a PLC or a dedicated timer to regulate heat generation, improve energy use, and maintain consistent process quality without mechanical contactors. Because the switching elements are semiconductor thyristors, reaction time is short and service life is longer than with electromechanical relays.
The electrical ratings set the installation limits. The unit accepts an input of 400 V -20% to 600 V +10%, covering typical medium-voltage feeders, and the trigger circuitry synchronizes with 50/60 Hz line frequency. Power is supplied on a two-phase AC network that matches resistance welding transformers. The thyristor stack conducts up to 200 A, allowing connection to primaries rated as high as 250 kVA. Gate logic and the internal timer both operate from a 24 V DC control supply, operation is limited to a 50% duty cycle, and heat is removed by natural airflow through the finned heat sink.
Thermal and enclosure limits affect cabinet layout. Continuous service is allowed up to 55 °C ambient, while inlet air for the heat sink must stay below 45 °C. Under those conditions, the assembly releases only 70 W of conduction and switching loss, which the aluminum fins dissipate without forced ventilation. The enclosure has an IP20 rating, so placement behind a closed panel is required in dusty or wet areas. Additional limits include a maximum altitude of 2000 m, storage from -25 °C to +70 °C, and cable lugs that accept conductors up to 95 mm².
Frequently Asked Questions about PST6250.105-L:
Q: What input voltage range is supported by the PST6250.105-L thyristor power unit?
A: The PST6250.105-L operates with an input voltage range of 400 V -20% to 600 V +10%.
Q: What is the maximum transformer power handled by the PST6250.105-L?
A: This power unit has a maximum transformer power capacity of 250 kVA.
Q: What is the system current rating of the PST6250.105-L thyristor power unit?
A: The PST6250.105-L is rated for a continuous system current of 200 A.
Q: What protection class is provided by the PST6250.105-L thyristor power unit?
A: It features an IP20 protection class, providing basic protection against solid objects.
Q: What phase type and cooling method are used in the PST6250.105-L?
A: The PST6250.105-L operates with a 2-phase AC input and is air cooled for temperature management.
