The Sonoff POW R3 is a very handy Wi-Fi switch with timer and energy meter for IoT applications. It can be controlled with Android or iOS with the eWeLink app. This Wi-Fi switch is also compatible with Amazon Alexa, Google Assistant, IFTTT and Google Nest. The device is easy to mount on a DIN rail. The R3 is an upgrade of the R2 in that it can switch and measure a much higher power.
Specifications:

• Supply voltage: 100 - 240V AC (50/60Hz)
• Switching voltage: 100 - 240V AC (same as supply voltage)
• Maximum switching current per channel: 25A (resistive load)
• Maximum switching power per channel: 5500W (resistive load)
• Number of channels: 1
• Wireless standard: 802.11b/g/n
• Security mechanism: WPA-PSK/WPA2-PSK
• Operating temperature: -10 - 40ºC
• Suitable DIN rail type: EN60715 (TS35/7.5 and TS35/15)
• Dimensions: 162 x 122 x 45.5mm