I needed to add an ethernet connection to a remote network device in my electrical panel, but didn't want to add a separate circuit and 120v outlet to power a to supply standard circuit breakers. I have this and it was powered by my Juniper EX3300-48P switch from a nearby ethernet pass with no problems. Seems a bit pricey for what it is, but overall it was cheaper and faster than the other options for my scenario.
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