Meross MSS620 16A IP44 Outdoor Plug (MSS620)
Meross MSS620 16A IP44

Available from:


Install method:
Replace module

GPIO #Component
GPIO00 None
GPIO01 Led_i 1
GPIO02 None
GPIO03 Led_i 1
GPIO04 Relay 2
GPIO05 None
GPIO09 None
GPIO10 None
GPIO12 Relay 1
GPIO13 LedLinki
GPIO14 Button 1
GPIO15 None
GPIO16 None
GPIO17 None
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This device uses MRE3S module which needs to be replaced with ESP8685-WROOM-01, ESP-12, ESP-C3-12F, ESP-12H, ESPC2-12 or ESP8684-WROOM-01C. Read more about module replacement in a detailed guide.

This device can be modified with ESP-12S module. I recommend preparing the module with flashing and configuring Tasmota with the given template. Then you need to open the device. Remove 4 case screws and use some force to open the housing. Then remove the 3 or 4 screws holding the PCB. Take out the board as good as possible and desolder the original Meross WiFi-module with hot air. Using Flux and tinning joints with leadfree solder is recommended before using hot air. Make sure to protect nearby components with heat resistant tape. Then solder prepared ESP-12S module on, test the device (be careful with wiring and 230V, shock danger), and put it together.

I have seen different PCB revisions of this device, you may have to switch some GPIOs for assigned functions if the given template doesn’t work for you.

Disassembly images