DENKO Variac/Dimmerstat/Auto transformer Single Phase 0-270V 2 Ampere closed Type with one year manufacturer warranty : Amazon.in: Industrial & Scientific
VF2SC - 2 Speed Controller - Loren Cook Company
Variable Auto Transformers (Variac) and Single Phase Variable Auto Transformer
Single phase speed controller by auto-transformer - RMB 10.0 Amp | Just Fans Ltd
AUTOTRANSFORMER SINGLE-PHASE FAN REGULATORS | Breve - manufacturer of transformers