This is good stuff.  This is used, but good.  I think you will like.  This came from surplus from a mine.  It was in a heavy duty protected rack mount for years, before we liberated this!   This is impossible to find except right here!!!  Get this before it goes away!      

NOTE -  we have other parts that went to this control device.  I have one another isolater that is VERY similar.  we also have an entire GE unit that these PCBs were housed in complete.  Please look at my other listing or ask questions.