STO型升降变压器是一种交流电压变换装置，它采用环形铁芯绕制，从而使功耗更小，效率更高，通过使用本产品后，将多种电网的电压转换为通用的电压输出，所有的电子电气设备在额定功率下均能安全使用。●  输入电压AC110V或220V●  具有熔断保护器或过流保护器●  输出电压AC220V或110V STO series step-up & down transformer is an AC voltage converting device.It is made of the windwith the annular iron core.thus make the product have low power consumptionand high efficiency.Us-ing it.to convert the multi-kind net.voltage into a general output voltage under which all the electronicunits are safe for use within the rated power range.●  Input voltage:AC110V or 220V●  With fuse protector or with over current protector●  Output voltage:AC220V or 110V