In a nut shell. Transfer switch senses incoming voltage (power company) through a relay. When relay drops out due to lack of voltage, contacts close and start the generator. When generator gets up to speed, second relay senses the generator's voltage and opens contactor that is connected to power company's incoming voltage. When that contactor is open, its auxiliary contact closes the generator contactor. The load side of both contactors are connected together to a load (could be a house, factory, hospital, machinery) With the generator contactor now closed the generator is supplying voltage to the load. Still with me? When the incoming (power company) voltage resumes, it energizes a timer until the power is stabilized, usually about 5 minutes. The timer contacts drop the generator contactor out, dropping the load for about a 1/4 of a second and re energises the incoming voltage contactor. The generator usually stays running up to 10 minutes to cool down and it then shuts its self off. The transfer switch is then ready for the next power failure. Some nut shell.
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An Automatic Transfer Switc (ATS) transfers automatically between two or more sources of power, one is usually the grid power source and the other may be a standby generator. No need for anyone to be existed while power outage.
Like any Automatic Transfer Switch, wiring ATS not easy and not difficult. It requires a qualified electrician to wire it properly. You can read more about wiring an Automatic Transfer Switch in the related link.
A transfer switch, in general, switches load between two sources. An automatic transfer switch or ATS is usually installed where a generator is located to allow the generator to give power while electricity is out.
The load have deference two feeder like transformer &generator when the power of transformer shutdown the load get power from second feeder generatoraoto
In conduit? direct burial? distance?
400 amps