ATS vs STS in data centre power
The difference between automatic transfer switches and static transfer switches, and where each is used in data centre power.
ATS: automatic transfer switch
An ATS moves a load between two sources, for example utility and DG, using electromechanical switching. The transfer takes a short interval, so it normally sits ahead of UPS systems, where the UPS carries the load during the transfer.
STS: static transfer switch
An STS uses semiconductor switching to move a critical load between two sources in a fraction of a cycle. It is used for dual-corded or single-corded IT loads that cannot tolerate a break.
Where each is used
ATS on the utility and DG side of the UPS; STS downstream, between two UPS outputs, in 2N or N+1 designs.
What Omega builds
We build the ATS panels, UPS distribution boards, PDUs and RPPs, and the panels around a customer-approved STS unit. See ATS, PDU and RPP panels.
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