[cricketo]

That's one of the SCR (Silicon Controlled Rectifier) units from General Electric. I have EV-1 in my electric forklift. This is like 1980's tech, you don't want to use it in a new project for many reasons (I will go lazy style here). Put it on Ebay, and get yourself an appropriately sized Kelly controller (or Curtis, if you're feeling lucky).

 

[InovaEE]

Here is a link for info for that unit you have https://www.google.com/url?sa=t&sou...EQFnoECAMQAQ&usg=AOvVaw2xm09MZOQ52Qlo5xfL7G2Q