... of BK2 Control Transformer20W, 30W, 35W, 2.5W, 4W, 10W, 40WEYEN is a professional electric power supply ... , for example automatic voltage regulator (AVR), UPS, power inverter & battery charger as well as voltage transformers etc ... , such as automatic voltage regulator, online UPS, power inverter, etc. Our products have been proved by ... the globe to contact us! [EYEN] BK control transformer BK2-40W