Cisco N9396Y12C-SE1 NX-OS Mode Switch Hardware Installation Guide

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Remove a power supply

Updated: January 22, 2026

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Overview

Steps to remove a power supply module from the switch.

You can remove one power supply while the other one provides power to the switch.

To disconnect the power supply from its power cables, shut off the power from the power source and disconnect the connector for the power cables.

Procedure

1.

Turn off the circuit breaker for the power feed to the power supply that you are replacing.

Verify that the LEDs turn off on the power supply that you are removing.
2.

Remove the power cable from the power supply by pressing the latch on the Cisco-supplied power cord to allow removal from the power supply.

  • Use the supplied cable to connect the power supply to external power.
3.

Grasp the power supply handle while pressing the release latch towards the power supply handle.
4.

Pull the power supply out of the bay.

Install an AC power supply

You can replace one power supply while the other one provides power to the switch.

Before you begin

  • The power supply that you are installing must be capable of using the same airflow direction as the fan trays installed in the same switch. It must use the same type of power source as the other power supply installed in the same switch. A mix of AC and DC power supplies in the same switch are supported for hot swapping purposes within a time limit of 15 minutes

    Note

    If the power supply that you are replacing has a different color handle than the replacement power supply, verify that it has or will have the same airflow direction as the other modules in the switch.

  • An AC power source must be within reach of the power cable that will be used with the replacement power supply. If you are using n+n power redundancy, there must be a separate power source for each power supply installed in the chassis. Otherwise, only one power source is required.

  • There must be an earth-ground connection to the chassis that you are installing the replacement module. Typically, the chassis is grounded by its metal-to-metal connection with a grounded rack. If you need to ground the chassis, see Ground the chassis.

Procedure

1.

Holding the replacement power supply with one hand underneath the module and the other hand holding the handle, turn the power supply so that its release latch is on the right side. Align the back end of the power supply (the end with the electrical connections) to the open power supply slot. Carefully slide the power supply all the way into the slot until it clicks into place.

Note

If the power supply does not fit into the open slot, turn the module over, before sliding it carefully into the open slot.
2.

Test the installation by trying to pull the power supply out of the slot without using the release latch.

If the power supply does not move out of place, it is secured in the slot. If the power supply moves, carefully press it all the way into the slot until it clicks into place.
3.

Attach the power cable to the electrical inlet on the front of the power supply.
4.

Verify that the other end of the power cable is attached to the appropriate power source for the power supply.
5.

Verify that the power supply is operational by making sure that the power supply LED is green.

Install a DC power supply

You can replace one power supply while the other one provides power to the switch.

Before you begin

  • The circuit breaker for the DC power source for the power supply must be turned off.

  • The power supply that you are installing must be capable of using the same airflow direction as the fan trays installed in the same switch.

  • A DC power source must be within reach of the power cable that will be used with the replacement power supply. If you are using n + n power redundancy, there must be a separate power source for each power supply installed in the chassis. A mix of AC and DC power supplies in the same switch are supported for hot swapping purposes within a time limit of 15 minutes. Otherwise, only one power source is required.

  • There must be an earth-ground connection to the chassis that you are installing the replacement module. Typically, the chassis is grounded by its metal-to-metal connection to a grounded rack. If you need to ground this chassis by another means, see Ground the chassis.

  • All DC power supplies have reverse polarity protection. When you inadvertently connect the input power (+) to the DC PSU’s – terminal and the input power – to the DC PSU’s (+) terminal, the PSU will not be damaged and will operate fine after the input power feeds are correctly wired.

Procedure

1.

Holding the replacement power supply with one hand underneath the module and the other hand holding the handle, turn the power supply so that its release latch is on the right side. Align the back end of the power supply (the end with the electrical connections) to the open power supply slot. Carefully slide the power supply all the way into the slot until it clicks into place.

Note

If the power supply does not fit into the open slot, turn the module over. Carefully slide it into the open slot.
2.

Verify the rack is properly grounded, so that when the chassis is installed in the rack, it will be grounded.
3.

Turn on the circuit breaker for the DC power source connected to the power supply.
4.

Verify that the power supply is operational by making sure that the power supply LED is green.