The AC power supply is a hot-insertable and hot-removable field-replaceable unit. It is convenient, that you can install it without powering off the switch or disrupting the switching function.
"I had one of the most pleasurable and efficient online purchasing experiences through Chicago Computer Supply. Todd went above and beyond my expectations for service, which definitely has convinced me to order from your store again in the future. It helps too that the product that I ordered arrived in perfect condition and has met my needs completely. Thanks again!."