Shelly EM Gen3 vs Shelly Pro EM-50

Shelly EM Gen3 is the better pick for most installs because it delivers the same two-channel single-phase metering, the same local control and a relay output for much less money, and it adds SmartThings support. Shelly Pro EM-50 earns its premium when you need ±1% accuracy, wired Ethernet, Modbus TCP, DIN rail mounting or 60 days of on-device history.

Form factor and networking. Shelly EM Gen3 is a 37 x 42 x 16 mm module that fits inside a wall box or an appliance enclosure and connects over Wi-Fi and Bluetooth only. Shelly Pro EM-50 is a one-module-wide DIN device for a consumer unit, with wired Ethernet and Modbus TCP alongside Wi-Fi and Bluetooth.

Shelly Pro EM-50 includes two 50 A current transformers, so both channels work out of the box. Shelly EM Gen3 includes one 50 A clamp and needs a second CT bought separately for its other channel, though it also accepts 80 A transformers, which is useful on a main feed.

Shelly Pro EM-50 keeps at least 60 days of one-minute records on the device, while Shelly EM Gen3 stores 10 days. Both also push longer history to the Shelly cloud, allow CSV export of the consumption chart and support cost periods and tariff distribution in the Shelly Smart Control app.

Yes. Both carry potential-free contacts rated 2 A at 240 V, intended to drive an external contactor rather than the load directly. That is how owners use either one to replace a timer on a pump, cut idle equipment or divert surplus solar production to a chosen appliance.

No. Both Shelly EM Gen3 and Shelly Pro EM-50 are single-phase devices with two current channels, so a North American 120/240 V split-phase service or a three-phase supply needs a different model. Both do handle bi-directional measurement, so solar import and export are tracked separately.