Shelly 1PM Gen3

The meter is an inexpensive, useful addition

Shelly 1PM Gen3 adds switching and AC consumption readings to one circuit while leaving an existing wall control in place. At €14.90 for a single relay, the meter costs only €1 more than Shelly 1 Gen3. For ordinary mains lighting or an appropriately rated appliance, that is a sensible extra: knowing how much power the load draws can be more useful than simply knowing the relay is on.

The EU shop had the single in stock on September 9, 2026, including VAT with shipping extra. Electrical installation is additional. The price is for a module that goes inside a suitable enclosure, not a finished plug or wall switch.

A powered output changes what it is suitable for

The 1PM has no dry contacts. Its output switches the supplied circuit, so it is not a direct substitute for a relay that closes a separate low-voltage control input. Choose the 1 Gen3 when that separate contact is the requirement, even though it lacks the meter.

This EU 1PM supports 110 to 240 V AC or 24 to 30 V DC power. Its manual explicitly says power measurement is unavailable on DC. The DC option is therefore a switching capability, not a reason to buy it for monitoring a battery-powered project.

For AC, the stated ceiling is 16 A; the DC limit is 10 A at 30 V. Those ratings do not establish that every motor, heater or LED driver is an appropriate load. Mains use needs a neutral, suitable protection and a qualified electrician. The 37 × 42 × 16 mm body also needs space for the wiring around it.

Useful readings without replacing a working relay

Shelly provides native power and energy readings, local browser control, timers and stored schedules. The measurements can help identify when a connected load is running or compare its consumption over time. They do not by themselves reduce a bill, and this review does not establish billing-grade accuracy.

Matter arrived in stable firmware 1.6.0. A working Gen3 can be updated and enabled for Matter instead of being replaced. Use Shelly's tools for the detailed meter and device settings; availability of energy displays in another Matter app depends on that platform. Local operation can work without Shelly Cloud.

The relay also supports scripting and MQTT. Matter reduces available scripting memory, so extensive code is a less convincing reason to buy Gen3 than its inexpensive switching and metering.

Full size is the better default when it fits

The 1PM Mini Gen3 costs the same but is smaller and limited to 8 A AC. Choose it when space is the actual constraint. The 1PM Gen4 costs €21.90 and adds an alternative Zigbee mode while retaining the same full-size format and core electrical limits. For a straightforward Matter metering relay, Gen3 keeps the stronger value argument.