LDR31254

Overview

The LDR31254 is a high-power Silicon Controlled Rectifier (SCR) module manufactured by Powerex Inc. under the POW-R-BLOK series. It features a series connection of all SCRs within a single chassis-mount package. The device is rated for a repetitive peak forward voltage of 1.2 kV and an on-state average current of 845 A. Key electrical parameters include a maximum gate trigger voltage of 2.5 V and a maximum gate trigger current of 250 mA. Non-repetitive surge currents are specified at 18,000 A for 50 Hz and 17,000 A for 60 Hz frequencies.

Feature Summary

• Chassis-mount industrial SCR module design
• Series-connected internal SCR structure
• High current handling capability

Applications

• Industrial motor drives
• Power supply systems
• DC power transmission applications

Procurement Notes

Verify component authenticity through authorized Powerex distributors or certified suppliers. Confirm that the physical marking matches the LDR31254 designation. Check for any specific ordering suffixes if required by your system design, as these may indicate variations in terminal configuration or packaging details not covered by the base part number.

Selection Notes

Select this module when high-voltage isolation and substantial continuous current capacity are required in a compact form factor. Ensure thermal management solutions can handle the heat dissipation associated with 845 A operation. Verify that the control circuitry can provide the necessary gate trigger signals within the specified voltage and current limits to ensure reliable switching performance.

Part Context

This component belongs to the POW-R-BLOK family of thyristor modules, which are designed for robust industrial environments. Powerex Inc. specializes in high-power semiconductor solutions, including discrete devices and integrated modules. The LDR31254 represents a standard offering in their SCR portfolio, balancing high voltage ratings with significant current throughput for heavy-duty applications.

Replacement Considerations

Consult official Powerex documentation for direct cross-references. Similar series modules like the LDR31854 exist but differ in current ratings and voltage specifications. Do not substitute without verifying electrical compatibility and mechanical footprint alignment with the original design requirements.