New and Improved!  Up until recently, there were 2 options for the VR3.1 regulators: 

• - The VR3.1 which was for 200-240 VAC for sensing & power. 
• - The VR3.1A which was for 90-130 VAC for sensing & power. 

Now the manufacturer has superseded them both to the VR3.1B.  This voltage regulator has a jumper that allows you to sense either 120 or 240 VAC.  The VR3.1B also has an extra 2 terminals for power input. So it needs to have an extra set of wires attached to the sensing terminals.  (It can be powered by an aux winding OR same L1 & L2 power as on the sensing terminals.)  The old ones (VR3.1 and VR3.1A) may be available for a little while, but will likely soon be phasing out. 

• Part #: VR3.1B
• 8 In Stock