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    QFX5200 AC Power Supply

    The two power supplies in QFX5200 are hot-removable and hot-insertable field-replaceable units (FRUs). The power supplies are installed in the switch at the factory. You can install replacement power supplies from the management panel without powering off the switch or disrupting the switching function. See Figure 1 for an example of a QFX5200 AC power supply.

    The AC power supply in QFX5200-32C switches is 850 W. Be sure to use the correct power supply for your chassis product SKU (see Table 1).

    Caution: Do not mix power supplies with different airflow or different wattage. The system raises an alarm when a power supply having a different airflow or wattage is inserted into the chassis.

    Figure 1: AC Power Supply in QFX5200 Switches

    AC Power Supply in
QFX5200 Switches
    AC appliance inlet
    Security latch
    Ejector lever

    The power supply provides FRU-to-port or port-to-FRU airflow depending on the product SKU you purchase. On legacy switches, or switches with an LCD, this airflow is called back-to-front and front-to-back. The power supplies either have labels on the handles that indicate the direction of airflow or they have color-coded handles with a fan icon. See Figure 2 for an example of the power supply. Either a power supply has the label AFI or a blue handle, which denotes FRU-to-port airflow. A power supply with the label AFO or a gold-colored handle denotes port-to-FRU airflow.

    Figure 2: Power Supply Handle Detail

    Power Supply Handle
    Fan icon on handle

    Caution: Verify that the airflow direction on the power supply handle matches the direction of airflow in the chassis. Ensure that each power supply you install in the chassis has the same airflow direction. If you install power supplies with two different airflow directions, Junos OS raises an alarm. If you need to convert the airflow pattern on a chassis, you must change out all the fans and power supplies at one time to use the new direction.

    Table 1 shows the different power supplies and their direction of airflow.

    Table 1: Airflow Direction in QFX5200 AC Power Supplies

    Product Number

    Direction of Airflow

    Color of Power Supply Handle



    Juniper Azure Blue



    Juniper Gold

    To avoid electrical injury, carefully follow instructions in Connecting AC Power to a QFX5200.

    Modified: 2017-09-13