Vigortronix auto transformers vigortronix vtx 186 1000 these 1000va auto transformers employ a single non isolated winding to step up or step down the available line voltage to match the requirements of the load examples include supply to fridges air conditioners compressors etc with its small size and weight the auto transformer can be installed easily in existing equipment vigortronix vtx 186 1000 auto transformer 1000va