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The diagram in Figure 2 shows a static bypass switch connected across a UPS. The UPS. could be a double conversion or a delta conversion or rotary type. The static bypass switch. provides a means to accomplish high-speed transfer to the bypass path in case of UPS.
A line interactive UPS directs main utility power to your equipment as long as it's available. This power is routed through a buck-boost transformer which corrects high or low voltage within a limited range. When the utility power fails this type of UPS switches to the battery as a source of temporary power.