ST /TC  type step up & down transformer / toroidal transformer/220v  power transformer  is specially designed for such electronic equipment whose rated AC voltage different from that of the local net voltage. They are safe for use within the rated voltage range.
1. Feature
This series step-up & step-down transformer is an AC voltage converting device.
Using it is to convert the multi-kind net voltages into a general output voltage
under which all the electronic units are
safe for use within the rated power range.
2. Main Technical Data
Phase no.: Single-phase
Input voltage: AC110V or 200V or 220V or 240V
Output voltage: AC110V & 220V.
With fuse protector or with over current protector
Main features: 
1. Heavy duty suitable for continuous use.
2. Terminal connection or plug & socket connection.
3. Various types of plug & socket, US, European, Schuko, VDE, UK, Asian, Australian, or as request.
4. Output up to 3 sockets.
5. Input voltage range: 110V/117V/120V/220V/230V/240V
6. Output voltage range: 220V/230V/240V/110V/117V/120V
7. Typical capacity: 100/200/300/500/800/1000/1500/2000/3000/5000/8000/10000VA, or customized
8. Frequency: 50/60HZ
9. Protection : fuse protector or over current protector.
10.Input voltage can be changed according to the user.
Suitable for Water Dispenser, Printer Rice Cooker, Fan, Fax Machine, Air Machine, Computer