Safety Transformers

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A safety transformer is manufactured according to the IEC 61558-2-6 standard for safety isolating transformers. The transformer is double wound, which means that the primary and secondary windings are completely separate and insulated from each other so the insulation can withstand a test voltage of 5,000 volts. These transformers usually have double insulation as well, meaning they don't have an earth connection and the transformer is encapsulated in a secondary insulating material. Safety transformers are available in a range of sizes, from 7VA up to 480VA and with primary windings designed for 230 volts or 400 volts AC. Many of these transformers are suitable for use on 50Hz and 60Hz supply systems. Some are used to drop 400 volts AC down to 230 volts, while others supply a convenient control supply voltage, such as 12 or 24 volts AC. DIN-rail mounted models are available. A special category of safety transformers are those intended as lighting transformers. These are mostly designed for connection to 230 volts AC, 50-60Hz, and the secondary voltage circuit is invariably 12 volts AC. These transformers are used to power 12 volt lighting circuits, such as ceiling-mounted downlights. Suppliers include Mascot, Nordic, Transformator-Teknik and Tufvassons Transformator