78177-1X

About the 78177-1X

The 78177-1X is a Thyristor Assembly originally manufactured by Reliance Electric. The part you are replacing may be identified as coming from ABB or Baldor Reliance depending on the year of manufacture. The 78177-1X is a 3 phase, 30/75 horsepower 460 V assembly. Like most thyristor assemblies, the 78177-1X is designed to perform a simple semiconductor function. It is useful in locations where electromechanical devices cannot be used due to limitations in speed or reliability. The 78177-1X is designed as two copper/selenium oxide stacks with a gate that can be triggered via a current across an SCR located between the two stacks. The thyristor will continue to conduct until the voltage is reverse biased or until it is removed. This unit is a fully on or off device and has no option of proportional current. ABB/Reliance Electric was responsible for providing original documentation to the user to help with maintenance, installation, and handling. If this documentation has been lost or misplaced, or if you never had such documentation, please let our staff know when you place your order as we may be able to provide a source for duplicates. Typically, orders received before 3 pm our time will ship out to you on the day of order placement. If you have questions about shipping options, or if you would like to know more about our automatic warranty service, please review the information available on our website. Our staff is also available to help with these questions. Expedited shipping options are available.