Uninterruptible power supplies (UPS) are backup batteries that provide emergency power to electrical systems in case power becomes unavailable. They are connected between a power source (such as an electrical outlet) and the equipment to protect (such as a motor or computer).
There are two main types of UPSs: single-phase and three-phase. DC power supplies are also available. Typically, single-phase UPSs are used with computers, bridges, routers, telecommunications...
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