Aitomatic phase changeover

 https://www.flipkart.com/amicismart-intelligent-3-phase-1-selector-changeover-switch-over-under-voltage-protection/p/itm79d44e00eb7c2

TRIO AUTOMATIC PHASE CHANGEOVER - 8060

https://trioproduct.in/automatic-changeover.php

https://saravanaelectricals.org/product-category/automatic-phase-changeover/

https://www.youtube.com/watch?v=30d4D8D1ly0 - tamil


do it your sef with relays


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