Transformer is a device that uses the principle of electromagnetic induction to change AC voltage. It mainly consists of a primary coil, a secondary coil and an iron core (magnetic core). The main functions are: voltage conversion, current conversion, impedance conversion, isolation, voltage stabilization (magnetic saturation transformer), etc. Transformers exported to the EU require CE certification.

CE certification standards for transformers:

EN61558-1: 2005

Safety of power transformers, supply units and similar equipment Part 1: General requirements and tests

EN61558-2-1: 1998

Safety of power transformers, power supply units and similar equipment Part 2-1: Particular requirements for general purpose isolating transformers

EN61558-2-2: 1998

Safety of power transformers, supply units and similar equipment Part 2-2: Special requirements for control transformers

EN61558-2-3: 2000

Safety of power transformers, power supply units and similar equipment Part 2-3: Particular requirements for gas and oil fired ignition transformers

EN61558-2-4: 1997

Safety of power transformers, power supply units and similar equipment Part 2-4: Particular requirements for general purpose isolating transformers

EN61558-2-5: 1998

Safety of power transformers, power supply units and similar equipment Part 2-5: Particular requirements for shaving transformers and shaving power supply units

EN61558-2-6: 1997

Safety of power transformers, power supply units and similar equipment Part 2-6: Particular requirements for general safety isolating transformers

EN61558-2-7: 1997

Safety of power transformers, power supply units and similar equipment Part 2-7: Special requirements for transformers used in toys

EN61558-2-8: 1998

Safety of power transformers, supply units and similar equipment Part 2-8: Particular requirements for bell and alarm clock transformers

EN61558-2-9: 2003

Safety of power transformers, power supply units and similar equipment Part 2-9: Special requirements for pan-grade hand lamp transformers for tungsten filament lamps

EN61558-2-12: 2001

Safety of power transformers, power supply units and similar equipment Part 2-12: Special requirements for constant voltage transformers

EN61558-2-13: 2000

Safety of power transformers, power supply units and similar equipment Part 2-13: Particular requirements for general purpose autotransformers

EN61558-2-15: 2001

Safety of power transformers, power supply units and similar equipment Part 2-15: Special requirements for isolating transformers used to supply power in medical premises

EN61558-2-17: 1997

Safety of power transformers, power supply units and similar equipment Part 2-17: Special requirements for switched mode power supply transformers

EN61558-2-19: 2001

Safety of power transformers, power supply units and similar equipment Part 2-17: Special requirements for switched mode power supply transformers

EN61558-2-19: 2001

Safety of power transformers, power supply units and similar equipment Part 2-19: Particular requirements for disturbance attenuating transformers

EN61558-2-20: 2000

Safety of power transformers, power supply units and similar equipment Part 2-20: Special requirements for small reactors

EN61558-2-23: 2000

Safety of power transformers, power supply units and similar equipment Part 2-23: Special requirements for transformers used on construction sites