Shelly 2PM Gen3 vs Shelly Plus 1

The Shelly Plus 1 edges it overall on safety and wiring flexibility, with documented overheating protection, dry and wet contact modes and support for low-voltage DC loads. The Shelly 2PM Gen3 is cheaper and better rated and offers two channels, energy monitoring, interlock mode and Matter support.

Channels versus contacts. The Shelly 2PM Gen3 has two relay channels with interlock and metering, built for shutters or two separate loads. The Shelly Plus 1 has one channel but adds dry contact isolation and DC switching, which the 2PM Gen3 does not offer.

It depends on the wiring. A gate or garage controller with a dry-contact input suits the Shelly Plus 1, which can isolate the relay from line voltage. A shutter or awning motor that needs up and down channels suits the Shelly 2PM Gen3, whose interlock mode prevents both directions being energized at once.

Only the Shelly 2PM Gen3, which supports both Matter and Apple HomeKit alongside Alexa, Google Home and Home Assistant. The Shelly Plus 1 has neither, so in an Apple household it needs a bridge or a Home Assistant setup to appear in the Home app.

Buy the Shelly Plus 1 if you need isolated dry contacts, want to switch a 30V DC circuit, or prefer a UL-listed module with overheating protection and a 3-year warranty. It is a dependable single-channel relay for boilers, gates and lighting where metering is not required.

Buy the Shelly 2PM Gen3 if you want two independent 16A channels in one module, per-channel consumption data, interlock mode for shutters and blinds, and Matter and Apple HomeKit support. It needs live and neutral at the install point and fits a standard back box.