Roller Contact Vertical Variacs can give +/- type output with carbon assembly moving in opposite directions [up/down]. For large current ratings these columns can be paralleled. Roller Contact Vertical Variacs is manufactured by Radio Electric Pvt. Ltd.
Radio Electric Pvt. Ltd also manufactures diverse types of transformers, dimmers, variable auto transformers, variable voltage regulators, variable voltage auto transformers, vertical roller contact variac, control panels, UPS etc. This Roller Contact Vertical Variacs looks like a conventional 3 ph transformer. This reduces the length of the column to 1/4 as compared to winding widthwise thus making it compact.
Roller Contact Vertical Variacs is available in various models:
