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title: "Changing AC Power Supplies"
canonical: "https://docs.infoblox.com/space/IIGFNA1A/14647372/Changing%20AC%20Power%20Supplies"
format: markdown
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**Note**: Before changing the power supply, make sure it is securely cabled. An apparently failed power supply may simply be improperly connected to its power source.

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***<span style="color: #ff0000">Caution</span>****<span style="color: #ff0000">:</span>* Never remove a correctly functioning power supply in a live system. Removing the power supply from a correctly operating Infoblox appliance appliance can cause a complete failure of the appliance and require an RMA (Return Material Authorization).

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The Network Automation NT-1400 ships with one AC power supply, with the option to add a second power supply for a redundant 1+1 configuration. In a 1+1 configuration, when a power supply fails for any reason, the other assumes the full load automatically and the Infoblox GUI displays a power supply alarm. The appliance can also be configured through the Network Automation software to send an email notification and to report an SNMP trap when such events occur in a 1+1 configuration. This configuration minimizes the chance of system failure due to failure of an individual power supply. *<span style="color: #000000">Figure 10</span>* illustrates the process of replacing an AC power supply.  
Each power supply weighs about one pound (0.454 kg). The faceplate of the power supply contains a power LED and a power switch. Each AC power supply provides a dedicated power outlet.

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Note: If your appliance comes with one power supply and an empty module, ensure that the power supply is in the PSU #1 slot and the empty module in the #2 slot. A single power supply runs only in #1 slot as shown in *<span style="color: #000000">Figure 10</span>*.

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*Figure 10* *Removing* *a Network* *Automation* *NT-1400* *AC* *Power* *Supply*   
    
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To replace a Network Automation NT-1400 AC power supply, do the following:

1. Turn off the power circuit to the appliance's AC power supply.
2. Disconnect the AC power cable from the appliance's AC power supply.
3. Gently press the black catch-release lever toward the handle, grip the power supply handle, and pull the power supply unit out of the chassis as illustrated in *<span style="color: #000000">Figure</span>*<span style="color: #000000"> </span>*<span style="color: #000000">10</span>*.
4. Place the replacement power supply into the bay and push it forward until it is fully seated in the chassis. The catch-release lever will gently click into place.
5. Reconnect the power cable.
6. Turn on the power supply. If it is fully seated, powered on, and operating, the LED glows steady green.

  
*Figure 11* Network Automation NT-1400 *with Dual AC* *Power Supplies*   
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