... small 4 Installation easy Product Description for Toroidal transformer:Professional power supply transformer used for the field of pro-amplifier, audio ... 115V, 120V, 230V, 240V / 50 Hz c. Secondary Customized Power range: 20VA to 10KVAd. Standard UL506, UL1411, EN61558, EN6060-1 ... and research team, and can provide best service for OEM/ODM as your clients, with superior quality, accuracy usage function. ...