Shelly SHEM-3

3EM

Device type

Smart Switch

Max power

1.22 W

Standby power

1.22 W

View discovery and setup instructions for this profile.

Powercalc can discover this model automatically (by entity). Look for a discovery prompt in Home Assistant and accept it to create the sensors. About discovery

Through the interface (recommended)

Start the Powercalc config flow, choose Virtual power (library), and pick Shelly → SHEM-3.

Open in Home Assistant

Add this to your configuration.yaml, replacing light.my_light with your own entity.

powercalc:
  sensors:
    - entity_id: light.my_light
      manufacturer: shelly
      model: SHEM-3

Library sensor documentation

Community usage

110 opted-in installations

2.07% of 5,314 reporting installationsOpt in to analytics

Device

Manufacturer: Shelly
Description: Smart Wi-Fi Three-Phase Energy Meter
Aliases: Shelly 3EM
Form factor: Din Rail
Connectivity: Wi-Fi
Barcode: 3800235262214
Product page: us.shelly.com
Power monitoring: Yes

Power

Power range: 1.22 – 1.22 W
Rated power: 1 W claimed
Standby power on: 1.22 W

Measurement

Calculation strategy: Fixed
Measure device: GW Instek GPM-8310
Measure method: Manual
Measure description: Manually measured. Transcribed from https://www.youtube.com/watch?v=RlSCe9xaUPE
Mains voltage: 230 V

Library

Created: Dec 1, 2024, 6:27 PM UTC
Updated: Sep 13, 2026, 9:41 AM UTC
Contributors: RubenKelevra
Discovery: Automatic, by entity
Only self usage: Yes

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Shelly SHEM-3

3EM

Set up manually instead

Through the interface (recommended)

Or configure with YAML

Device

Power

Measurement

Library

Device

Power

Measurement

Library

3EM

Set up manually instead

Through the interface .css-bxmwoh{margin:0;font-family:"Roboto","Helvetica","Arial",sans-serif;font-weight:400;font-size:0.875rem;line-height:1.43;letter-spacing:0.01071em;}(recommended)

Or configure with YAML

Or configure with YAML

Device

Power

Measurement

Library

Device

Power

Measurement

Library

Through the interface (recommended)