Automatic changeover shifts to generator load automatically after the absent of all three phases of mains and when the generator is started. If any of the phase from mains side returns the generator goes on no load condition and load is automatically shifted to main section.
Magnetic Contactor
magnetic contactors are a form of electrical relay found on most electrically powered motors. They act as a go-between for direct power sources, and high-load electrical motors in order to homogenize or balance out changes in electrical frequency which may come from a power supply as well as to
act as a safeguard.

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