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Which component makes an online UPS different from offline UPS?

Which component makes an online UPS different from offline UPS? Correct Answer Static switch

Static transfer switch makes an online UPS different from offline UPS. The block diagrams of both the UPS are shown in the figure.

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Static transfer switches (STS) are such electrical devices which are used for very fast switching between electrical power sources. It is used in UPS to immediately switch main power supply, to its stored backup power. They perform instantaneous switching operations and thus supply immediate power to the load.

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