Part Number : C-MH-18-790A-CM
Function : DC Motor controller / No IR Module Required
Maker : Electrol ( http://www.electrolco.com )
Image : 
Description :
1. Multiple horsepower dual voltage rating
2. 12 amperes (DC) continuous rating ( with heat sink)
3. 2% regulation of base speed
4. 50:1 speed range (constant torque)
Features
1. Single model for 90V and 180V applications
2.Trim pots and Terminal blocks arranged for easy installation & adjustment
Reference PDF : http://www.electrolco.com/files/Open%20Manual.PDF%20Below/World_Class_790A.pdf
Datasheet PDF Download : 
Others datasheet of same file :
CMH-18790-CM, CMH18790ACM, C-MH-XB-790A-E