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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.
On larger UPS the internal static bypass should be engaged before throwing the maintenance bypass. Some bypasses have interlocks to ensure this correct operation. After setting the UPS into bypass mode (to synchronise with the mains supply), Sw1 is operated to provide raw mains to the load. Sw2 may be opened to allow safe working on the UPS or may be left closed if the engineer wishes to make tests with the power on.