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By certification 
Advantages of toroidal transformers
High Efficiency
Smaller in size
Lower in weight
Less mechanical hum
Low exterior magnetic field
Low off load losses
Single mounting point
Technical Data
Capacity: 20VA-25000VA
Phase: Single
Input: AC Power with Voltages of Various Countries
Output: AC Current, Voltage, According to Customers Requirements
Frequency: 50-60Hz
Voltage Regulation: 12%-3%
Manufacture Standard: GB/T15290-94, GB/19212-2006, GB2828-2829-
Insulation Class: B, 130 Celsius Degree; E, 120 Celsius Degree 87
Temperature-rise: ≤85 Celsius Degree
Winding conductor material; usual us copper, can use aluminum if you
have special requirements
High Efficiency
Smaller in size
Lower in weight
Less mechanical hum
Low exterior magnetic field
Low off load losses
Single mounting point
Technical Data
Capacity: 20VA-25000VA
Phase: Single
Input: AC Power with Voltages of Various Countries
Output: AC Current, Voltage, According to Customers Requirements
Frequency: 50-60Hz
Voltage Regulation: 12%-3%
Manufacture Standard: GB/T15290-94, GB/19212-2006, GB2828-2829-
Insulation Class: B, 130 Celsius Degree; E, 120 Celsius Degree 87
Temperature-rise: ≤85 Celsius Degree
Winding conductor material; usual us copper, can use aluminum if you
have special requirements