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Key Takeaways

Best for: Watching one or two big circuits
Standout: Contactor output can switch a heavy load
Watch out: Only two 50A channels
Not for: Whole-home monitoring on its own

The Shelly Pro EM-50 is a two-channel DIN-rail energy meter with 50A clamps and a built-in contact for switching a contactor. It is made for watching your biggest circuits, like an EV charger, heat pump or solar feed. It sells for about $110 to $130.

What you need before you buy

An electrician: the clamps go inside the panel and the meter needs a wired power feed.
A DIN rail or small enclosure next to the panel.
A contactor only if you want it to switch a load on or off.

What you can track

Live and total use on two circuits, in both directions, so it can show what a solar array or home battery is producing. Through the Shelly app or Home Assistant you can set rules, like cutting a water heater during peak hours.

How it compares

	Shelly Pro EM-50	Shelly EM Gen3	Emporia Vue 3
Typical price	$110–$130	$65–$75	$100–$200
Sensors	2 x 50A channels	2 channels (one 50A clamp included)	Mains + up to 16 circuits
Connects via	Wi-Fi, Ethernet	Wi-Fi	Wi-Fi
Solar tracking	Yes	Yes	Yes
Best for	Big circuits + load switching	Budget, simple setup	Per-circuit detail

See my Shelly EM Gen3 and Emporia Vue 3 reviews.

Want to see other Energy Monitors? Compare them side by side →

How I researched this: Shelly’s Pro EM-50 product page and knowledge base, the Amazon listing, and Shelly’s US installation video. Prices checked October 30, 2026.

Shelly Pro EM-50

The Shelly Pro EM-50 tracks two big circuits, like an EV charger or heat pump, and can switch a heavy load through a contactor. Here is who it suits.

Product Brand: Shelly

Editor's Rating:
4.3

Pros

Two 50A channels track two circuits, such as an EV charger and a heat pump
Built-in contact can drive a contactor to switch a big load on or off
Wi-Fi plus wired Ethernet for a steady connection
Tracks solar or battery circuits in both directions
Works locally with Home Assistant

Cons

Two channels only, not a whole-home monitor for most houses
Clamps max out at 50A per channel
DIN-rail mounting usually needs a small enclosure in US homes
Contactor control needs a separate contactor and an electrician

Specs

Model	Shelly Pro EM-50
Channels	2, with two 50A split-core clamps
Accuracy	About 1%
Measures	Consumption and production (bidirectional)
Switching	Built-in dry contact for an external contactor
Connectivity	Wi-Fi, LAN (Ethernet), Bluetooth
Mounting	DIN rail
App	Shelly Smart Control; Home Assistant and MQTT supported

Verdict

The Pro EM-50 is a smart way to watch your biggest loads, and its contactor output can even turn one off when power is tight. It is not a whole-home monitor, so pair it with a main meter or pick the Shelly Pro 3EM if you want total house usage.

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Common Questions

Can it monitor my whole house?: Usually not. Its two clamps are rated 50A each, while most US homes have 100A to 200A mains. Use it for big individual circuits, or choose the Shelly Pro 3EM for the whole home.
What is the contactor output for?: It can drive an external contactor (a heavy-duty relay) so you can switch a large load like a water heater on a schedule or when usage is high. An electrician must fit the contactor.
Do I need an electrician?: Yes. The clamps go inside your panel and the meter needs a wired power feed.

Shelly Pro EM-50 Energy Meter Review