how we control automatic generator i'e with to supply (main supply and loc

how we control automatic generator
i'e with to supply (main supply and local generator)
when the main supply was break to supply the local supply
automatically to begin supplying power.I now this control
circuit is the combination of contactor time delay contactor
switch and overload relay .but my question is how we combine
those component
thank you

Question Posted / sintayew

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