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Russian Power Thyristor Disc T143 Series

Thyristors T143 are general-purpose pill-type thyristors designed to regulate and convert both DC and AC currents up to 1250A with a frequency of up to 500Hz in circuits with voltages ranging from 200V to 6600V. The polarity of the thyristor is determined by the symbol on its housing. Thyristors come in three housing types: PT41, PT42, PT43, where “PT” stands for “pill thyristor.” The T143 series includes various models: T143-320, T143-400, T143-500, T143-630, T143-800, T143-1000, and T143-1250.

During assembly, thyristors are connected to coolers using threaded connections. To minimize electrical losses and maximize heat dissipation, it is essential to provide the required tightening torque, known as the clamping force (Fm) – set at 15±1.5 kN. Compliance with the specified clamping force is determined by the deflection of the traverse.

For improved heat dissipation during assembly, heat-conductive paste KPT-8 can be used, although it is not a mandatory mounting condition. Thyristors can be manufactured for operation in various climates, including moderate, cold (HL), and tropical (T) environments.

T143 Appearance

LJT14312508 43 UHL2  

  • LJ-MD 
  • Т Low Frequency thyristor
  • 143 Series
  • 1250 A = IT(AV)
  • 8 *100V = URRM
  • 4 code for dUD/dt)cr
  • 3 code for tq
  • UHL2 for moderate and cold climates

For Symbols explanation CLICK HERE.

Part NumberUDRM/URRMIT(AV)ITRMSITSMTjmaxUTM/ITMUT(TO)rTIDRM/IRRM(dUD/dt)crIGTUGT(diT/dt)crtqi2tRth(j-c)Outline
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Looking to revolutionize your power control solutions? Look no further. At LJ-MD, we specialize in delivering cutting-edge diode and thyristor technologies that meet the highest industry standards. With a strong focus on innovation, reliability, and performance, our products are designed to excel in a wide range of power applications.


From high surge current capability to precise power control, our diodes and thyristors offer exceptional features that cater to your specific needs. Whether you require efficient rectification, fast switching, or precise phase control, our products deliver reliable and precise results.


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