CLIP 2856393 - Caterpillar

The bypass circuit powers the critical bus for one of the following reasons:
When maintenance is required
When the UPS cannot maintain voltage to the load due to sustained overload or malfunctionThe bypass circuit provides a path for power directly from an alternate AC (bypass) source. The UPS control system constantly monitors the availability of the system bypass circuit to perform a transfer.The system bypass circuit consists of the following components:
Static bypass switch
UPS output contactor
System bypass contactorThe UPS output contactor isolates the UPS module output. System bypass contactor works in parallel with the optional static bypass switch, if equipped. The static bypass switch is a solid-state device that can instantaneously connect the alternate AC source to the load.