Here is an interesting device without metering but with a interesting protection mechanism.
![[BK7321T] Prosto WFU-18 socket without metering - teardown, schematic and setup](https://obrazki.elektroda.pl/7430691400_1681897959_thumb.jpg "[BK7321T] Prosto WFU-18 socket without metering - teardown, schematic and setup")
![[BK7321T] Prosto WFU-18 socket without metering - teardown, schematic and setup](https://obrazki.elektroda.pl/3314900700_1681897966_thumb.jpg "[BK7321T] Prosto WFU-18 socket without metering - teardown, schematic and setup")
Surprisingly it is not glued or ultrasonically welded, instead it has 2 screws on the bottom and opening is somewhat easy.
![[BK7321T] Prosto WFU-18 socket without metering - teardown, schematic and setup](https://obrazki.elektroda.pl/6529984800_1681898088_thumb.jpg "[BK7321T] Prosto WFU-18 socket without metering - teardown, schematic and setup")
There is a single screw holding a board down and one tab near the relay to de-solder.
![[BK7321T] Prosto WFU-18 socket without metering - teardown, schematic and setup](https://obrazki.elektroda.pl/1922740800_1681898180_thumb.jpg "[BK7321T] Prosto WFU-18 socket without metering - teardown, schematic and setup")
![[BK7321T] Prosto WFU-18 socket without metering - teardown, schematic and setup](https://obrazki.elektroda.pl/1393590800_1681898182_thumb.jpg "[BK7321T] Prosto WFU-18 socket without metering - teardown, schematic and setup")
Interesting bit is that device that is hanging on those yellow wires, that is a temperature fuse (86'C/250V) nested inside a metal holder that is acting as a heater in case load is greater than specified. Device is based on BK7321T chip (WB2S module)
Other than that it is very generic WiFi controlled switch/relay outlet. Here is the schematic for it (not all values are correct and present!!!)
![[BK7321T] Prosto WFU-18 socket without metering - teardown, schematic and setup](https://obrazki.elektroda.pl/5150018600_1681898375_thumb.jpg "[BK7321T] Prosto WFU-18 socket without metering - teardown, schematic and setup")
And finally here is the pin setup tested and working with present build (1.17.10)
![[BK7321T] Prosto WFU-18 socket without metering - teardown, schematic and setup](https://obrazki.elektroda.pl/7430691400_1681897959.jpg "[BK7321T] Prosto WFU-18 socket without metering - teardown, schematic and setup")
![[BK7321T] Prosto WFU-18 socket without metering - teardown, schematic and setup](https://obrazki.elektroda.pl/3314900700_1681897966.jpg "[BK7321T] Prosto WFU-18 socket without metering - teardown, schematic and setup")
Surprisingly it is not glued or ultrasonically welded, instead it has 2 screws on the bottom and opening is somewhat easy.
![[BK7321T] Prosto WFU-18 socket without metering - teardown, schematic and setup](https://obrazki.elektroda.pl/6529984800_1681898088.jpg "[BK7321T] Prosto WFU-18 socket without metering - teardown, schematic and setup")
There is a single screw holding a board down and one tab near the relay to de-solder.
![[BK7321T] Prosto WFU-18 socket without metering - teardown, schematic and setup](https://obrazki.elektroda.pl/1922740800_1681898180.jpg "[BK7321T] Prosto WFU-18 socket without metering - teardown, schematic and setup")
![[BK7321T] Prosto WFU-18 socket without metering - teardown, schematic and setup](https://obrazki.elektroda.pl/1393590800_1681898182.jpg "[BK7321T] Prosto WFU-18 socket without metering - teardown, schematic and setup")
Interesting bit is that device that is hanging on those yellow wires, that is a temperature fuse (86'C/250V) nested inside a metal holder that is acting as a heater in case load is greater than specified. Device is based on BK7321T chip (WB2S module)
Other than that it is very generic WiFi controlled switch/relay outlet. Here is the schematic for it (not all values are correct and present!!!)
![[BK7321T] Prosto WFU-18 socket without metering - teardown, schematic and setup](https://obrazki.elektroda.pl/5150018600_1681898375.png "[BK7321T] Prosto WFU-18 socket without metering - teardown, schematic and setup")
And finally here is the pin setup tested and working with present build (1.17.10)
"pins": {
"6": "Btn;0",
"7": "WifiLED_n;0",
"8": "LED_n;0",
"24": "Rel;0"
},