TP-Link TL-PA251 User Manual page 14

TL-PA251 AV200 Powerline Adapter with AC Pass Through
The hardware connection mechanism is shown below:
Note:
Where the MAINS plug or an appliance coupler is used as the disconnected device, the disconnect
device shall remain readily operable. The idle wall sockets or electrical outlets in your household
electrical circuit can be used normally without interference from the network.
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