Shelly Pro 3EM 120A
#3 in Whole-homeFull review
The first-generation Pro 3EM with a longer warranty; buy the v2 if you want Matter.
Amazon $153.33$153.33
None in box (up to 3)±1%
3.2/5
An inexpensive meter for a single circuit you care about, such as a sub-panel or heat pump.
- None in box (up to 2)Circuits
- 3 yearsWarranty
Check price at Amazon$69.99
Price checked November 9, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Cheapest way to meter one or two big loads
- Works with Home Assistant, Alexa and Google Home
- Contactor relay for load shedding
Cons
- Only one clamp included
- Not a whole-panel monitor
How it scores
The rating comes from 6 measured or published factors, each scored 0-100 against fixed reference points for its type. How we rank explains each one.
Specifications
| Model number | EM Gen3 |
|---|---|
| Monitoring | |
| Branch circuits included | None in box (up to 2) |
| Most circuits supported | 2 |
| Branch CT rating | 50 A |
| Connectivity | |
| Connection | Wi-Fi |
| Home Assistant | Yes |
| Build | |
| Warranty | 3 years |
Alternatives in this type
Shelly Pro 3EM 120A v2
#4 in Whole-homeFull review
A DIN-rail meter for installers and tinkerers who want local control and solar metering.
Amazon $154.99$154.99
None in box (up to 3)Local±1%
Shelly Pro 3EM 3CT63
#6 in Whole-homeFull review
A tidy 63A three-phase meter for small sub-panels.
Amazon $150.99$150.99
None in box (up to 3)
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