Re: What is a "throat controlled relay"

Don Vollrath

A throat controlled relay is  a DPDT relay used to set the polarity of the reversing loop based on the position of a turnout or “throat “ to following tracks. The fast acting  relay takes the place of a sometimes finicky (and expensive) AR controller. 
You provide the relay. You figure out how to selectively turn it on/off depending on the position of the throw bar of the turnout. 
Allan shows how to do this on his website using a 12Vdc relay and a diode with the relay coil wired from a Tortoise or other stall type reversible   turnout motor. The relay provides a fast polarity switch and greater amp capacity than other ‘slide switch’ mechanisms. 


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