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Reference.org
Transfer switch
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<p>A transfer switch is an electrical <a href="/facts/Switch/vqbNDgYm">switch</a> that switches a load between two sources. Some transfer switches are manual, in that an operator effects the transfer by throwing a switch, while others are automatic and trigger when they sense one of the sources has lost or gained power. </p><p>An <i>Automatic Transfer Switch</i> (ATS) is often installed where a backup generator is located, so that the generator may provide temporary electrical power if the <a href="/facts/Electricity_distribution/F5NfTeWP">utility</a> source fails. </p>