Shelly 1 Gen3 vs Shelly 2PM Gen3

The Shelly 1 Gen3 wins this matchup on balance, thanks to a lower price, broader integrations including Samsung SmartThings, and confirmed dry-contact and wet-contact wiring. The Shelly 2PM Gen3 is the better choice when you actually need two channels, energy monitoring or a motorized cover mode.

Channels and wiring. The Shelly 1 Gen3 is a single-channel relay that installs without a neutral wire and switches AC or 12-48V DC loads, while the Shelly 2PM Gen3 is a two-channel relay that requires a neutral and adds per-channel energy monitoring and a cover mode for shutters.

No. The Shelly 1 Gen3 can be installed without a neutral wire, which makes it handy for older switch boxes and ceiling-box retrofits. The Shelly 2PM Gen3 does require a neutral connection.

The Shelly 2PM Gen3 has built-in per-channel power metering, so you can track consumption on each circuit. The Shelly 1 Gen3 does not include energy monitoring; a Shelly PM model is the option if you need metering on a single circuit.

DIY automators who want a cheap, tiny single-circuit relay that works without a neutral, supports dry and wet contacts, and runs AC or DC loads for garage doors, pumps and irrigation. It also adds Samsung SmartThings alongside Alexa, Google Home, HomeKit and Home Assistant.

Buyers who need to switch two circuits or automate a roller shutter, blind or gate from one module, with per-channel energy monitoring built in. The Shelly 2PM Gen3 needs a neutral wire, so confirm your wiring before installing.