UNINTERRUPTIBLE POWER SUPPLY

An uninterruptible power supply includes an uninterruptible-power-supply module including a power converter to convert AC power supplied from an AC power supply and to supply converted AC power to a load, and a power conversion housing accommodating the power converter; a bus part arranged outside the power conversion housing to input/output power from/to the uninterruptible-power-supply modules; a module interrupter provided between the uninterruptible-power-supply module and the bus part to electrically disconnect the uninterruptible-power-supply module from the bus part; a bypass circuit part including a switching circuit for switching electrical conduction to supply AC power from a bypass AC power supply to the load; and a housing-accommodating part to accommodate the power conversion housing. A plurality of uninterruptible-power-supply modules is provided as the uninterruptible-power-supply module. The module interrupter includes a plurality of first interrupters and a plurality of second interrupters.