Tripp Lite SmartOnline Single-Phase UPS systems (5 kVA and above) feature an external manual bypass switch and a detachable input/output power distribution unit (PDU). When the switch is set to "bypass," the UPS module can be removed for maintenance while the detachable PDU module remains installed, continuing to power connected equipment as long as utility power is present. These unique availability features are in addition to an automatic internal bypass that ensures 100% availability of connected equipment by passing through utility power in the event of an internal fault or overload.