Dell SC180 Owner's Manual page 20

Figure 10. Removing a PSU
1. Release tab
4. Slide the replacement PSU into the chassis until it is fully seated and the release tab clicks into place.
5. Connect the power cable to the PSU and make sure that the cable is plugged into a power outlet.
6. Secure the power cable using the clip.
Figure 11. Securing the power cable
7. Press the power switch on the PSU to turn it on.
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2. Handle
Replacing SC180 Expansion Enclosure Components