Product Description:

The PST6100.330-L thyristor power unit is produced by Bosch Rexroth Indramat for the PST Thyristor Power Units series. Designed as a solid-state switch for controlling high current in welding lines, induction heaters, and other power-demanding automation nodes, it modulates AC waveforms through phase-angle firing to achieve accurate thermal or magnetic output without mechanical contactors. This operating method allows precise power regulation while avoiding the wear associated with mechanical switching devices.

The unit draws its logic and gate drive from a control supply of 24 V DC, and this low-voltage circuit simplifies interface wiring. It can pass a nominal system current of 130 A, allowing service for mid-range transformers and heating elements. An internal transformer rated at 76 kVA sets the available power capacity for the connected load. Heat is removed by air cooling, which channels cabinet air across the heat sink. The assembly carries an IP20 degree of protection that guards against accidental contact with live parts. Cabinet loss is limited to 70 W, overvoltage protection is provided by a metal-oxide varistor network, and recessed mounting secures the chassis inside the panel while leaving only the faceplate accessible.

Integrated temperature monitoring opens the control loop when the heat sink temperature exceeds its limit, and operation is permitted up to a maximum ambient of 55 °C provided the cooling air does not rise above 45 °C. The insulation system uses Class F materials, supporting reliable dielectric separation under humid conditions. For intermittent loads, the device supports a 50 % duty cycle that suits applications with periodic high-current pulses. Field terminals accept conductors up to 50 mm², so low-impedance connections can be maintained between the unit and the bus bars. Installation is possible up to 2000 m elevation without derating, and timing coordination with the host controller is handled by an INTERBUS timer interface. MOV suppression further protects the thyristors from line spikes.