| 摘要 |
An automatic transfer switch includes; a housing, at least one switch for switching electrical connection from a first external power source to a second external power source, and a first and at least a second timer disposed within the housing, wherein the first and the at least a second timer have a first and at least a second time delay, respectively. The at least one switch being responsive to the first and the at least a second timer, and the at least a second time delay being nested within the first time delay.
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