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  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

400v main transformer

Try to get one from a contactor control panel for 3 phase motors.
You may get one from a surplus electronics shop.

Often on 3 phase equipment a 400 (EU) or 480 (US) Volts supply is used for the motors while the contactor coils are supplied from a 24 V.ac transformer on the control panel.
 

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