2026 verdict
The
Shelly 2PM Gen3 gets the nod for shutters and dual circuits, as the better rated relay with two channels and full overload protection.
It meters each channel, drives motors in interlock mode for roller shutters, blinds and garage doors, and cuts power on overheating, overvoltage, overcurrent and overpower. The
Shelly 1 Gen4 counters with radios: Zigbee through a hub with Zigbee routing on top of Wi-Fi, Bluetooth and Matter, plus documented dry and wet contact modes and a 3-year warranty. Both are rated 16A, need a neutral, share the 37 x 42 x 16 mm body and work with Alexa, Google Home, Apple Home, SmartThings and Home Assistant. Choose the
Shelly 2PM Gen3 for covers or two circuits with metering, and the
Shelly 1 Gen4 for a single circuit in a Zigbee home or a dry contact job.
What owners say
Owners of both Shelly relays praise local control and dependable Home Assistant integration. Shelly 2PM Gen3 owners run roller shutters, blinds and garage doors, praise a Wi-Fi link that holds deep in the wall box and per-channel metering, and a minority report a frustrating first pairing, trouble adding it to Alexa and a slightly thicker body than before. Shelly 1 Gen4 owners use it for single-circuit jobs like momentary garage door triggers, pool heater relays and detached mode for scene control, with schedules that survive outages; they warn that Zigbee pairing on hubs like Hubitat is fiddly and underdocumented and that it is a tight fit in a crowded box.
