LDR31050

Overview

The LDR31050 is a dual SCR isolated module from Powerex Inc., designed for high-power industrial applications. It features a series connection of two SCRs and one diode within a single chassis-mount package. The device supports an off-state voltage of 1.8 kV and handles a maximum on-state current (It(RMS)) of 785 A, with an average current rating of 500 A. Operating temperatures range from -40°C to 130°C.

Feature Summary

• Dual SCR configuration with integrated diode in a series connection topology
• High-voltage isolation capability up to 1.8 kV for robust circuit protection
• Chassis mount design utilizing POW-R-BLOK™ technology for efficient thermal management

Applications

• Industrial motor drives and variable frequency drives
• High-power DC power supplies and rectifiers
• Static VAR compensators and power factor correction systems

Procurement Notes

Verify the specific datasheet version corresponding to the 1.8 kV / 785 A rating, as the LDR3__50 family includes variants with different voltage levels such as 800 V or 1600 V. Confirm that the gate trigger current specification aligns with your control circuit requirements, as values may vary between 250 mA and other limits depending on the exact manufacturing batch or sub-model revision.

Selection Notes

Select this component when a compact solution for high-current AC/DC conversion is required. Ensure the mounting surface can handle the thermal dissipation associated with 785 A RMS operation. Verify that the system's peak reverse voltage does not exceed the 1.8 kV rating under transient conditions. Consider the physical dimensions of the chassis mount interface for mechanical integration.

Part Context

This module belongs to Powerex's POW-R-BLOK™ line of isolated thyristor modules. These components are engineered for reliability in demanding environments, offering superior thermal performance compared to discrete assemblies. The LDR31050 specifically addresses applications requiring high voltage blocking and significant current handling in a standardized footprint.

Replacement Considerations

Direct replacements must match the 1.8 kV voltage rating and 500 A average current capacity. Check compatibility with the POW-R-BLOK™ mounting style. Other models in the LDR3__50 series may differ in voltage ratings; ensure the substitute part number explicitly confirms the 1.8 kV specification.