Shelly Plus 1 vs Shelly Plus 2PM

The Shelly Plus 2PM wins overall: it costs less, controls two circuits instead of one, meters both, adds cover and interlock mode, and lists a complete overheating, overvoltage, overcurrent and overpower protection set. The Shelly Plus 1 only wins if you need its higher 16A single-channel rating.

Channels and metering. The Shelly Plus 2PM drives two circuits with per-channel consumption data and can interlock them to run a shutter motor. The Shelly Plus 1 has a single unmetered channel, though it is rated higher at 16A against 10A per channel on the 2PM.

The Shelly Plus 1, at 16A on AC compared with 10A per channel on the Shelly Plus 2PM. For a water heater or a high-current appliance that difference matters. For lighting, sockets, fans and shutter motors, the 2PM's 10A per channel is usually more than enough.

Yes. Both the Shelly Plus 1 and the Shelly Plus 2PM support dry and wet contact modes, so either can isolate its relay for a gate controller, boiler input or doorbell circuit, and both can also switch low-voltage DC loads up to 30V.

Buy the Shelly Plus 2PM if you want two metered channels in one module or need to automate a roller shutter, blind or gate with interlock protection. It offers dry and wet contacts, a full protection set, local Home Assistant control and a 3-year warranty, and needs live and neutral.

Buy the Shelly Plus 1 when one circuit needs the full 16A and you do not need metering, for instance a heater or a high-current appliance. It is UL listed, lists overheating protection, supports dry contact isolation and DC loads, and comes with a 3-year warranty.