Pro 3EM-3CT63 Energy Meter
A DIN-rail energy meter for single or three-phase boards, reading up to 63 A per phase through three 9 mm clamps. Sixty days of minute-by-minute history kept on the device, over ethernet or Wi-Fi.
$209.95 inc GST In stock · ships today
Max current
Currently sold out.
Comes with free shipping Order before 3pm Melbourne time on a weekday and it ships the same day.
30-day returns Unused items, easy online returns
3-year warranty Backed by Shelly
Everything you need to know
The sections below cover what this meter does, the jobs people put it on, the full specifications, and how warranty and returns work. If something's still unanswered, the questions at the bottom cover the common ones.
Product features
What this meter does
The Pro 3EM-3CT63 reads a whole switchboard. It takes three 63 A split-core clamps with a 9 mm aperture, one per phase, and reports voltage, current, active and apparent power for each of them in real time to ±1% on the current range that matters. It handles single-phase and three-phase installations, so the same meter suits a house or a small commercial board. One thing to plan for: it has no relay of its own. If you want it to drive a contactor, that takes the Shelly Pro 3EM Switch Add-on, which clips onto it on the rail.
- Three 63 A clamps, 9 mm conductor aperture
- Single-phase or three-phase installations
- ±1% accuracy from 2 to 63 A
- No built-in relay, contactor control needs the Switch Add-on
Sixty days of history, on the rail
This is a DIN-rail meter, so it lives in the switchboard alongside the breakers rather than in a wall box. It connects over ethernet or Wi-Fi, and it keeps at least sixty days of readings at one-minute resolution in non-volatile memory, with a real-time clock so the timestamps survive a network outage. Data comes out over MQTT, HTTP or WebSocket, with TLS on inbound connections.
- DIN-rail mount, in the switchboard
- 60 days at one-minute resolution, stored on the device
- Ethernet or Wi-Fi, with a real-time clock
- MQTT, HTTP and WebSocket, TLS on inbound
What is a Shelly energy meter?
A Shelly energy meter measures the power a circuit is using. It shows how much that circuit is using right now, keeps a running total of how much it has used over time, and stores one-minute records on the meter itself. It does not turn anything on or off, so every switch and appliance on the circuit works exactly as it did before the meter went in. You see the numbers in the Shelly app, or in Home Assistant through its Shelly integration, with no Shelly account in the middle.
Power usage
See where the power goes
Clamp the mains where they land in the switchboard and you see what the whole house is using, right now and over time. Put a meter on a single circuit, like the hot water or the air conditioner, and you see what that one thing costs to run.
Automations
Switch a load off when it runs high
An automation can run when a circuit climbs past a figure you set, like turning a heater off during a high tariff window. The meter supplies the reading, and a relay or a contactor does the switching. The EM Gen3 and Pro EM-50 have a built-in output for driving a contactor.
Solar
Import and generation, separately
One channel on the mains and one on the solar circuit gives you what you imported and what your roof made, as two separate numbers. A single channel nets them together and hides both. The clamp reads the current in the cable, so the meter works the same whoever made the panels or the inverter.
Alerts
Know when something finishes or fails
When a circuit drops to nothing, whatever was running has finished, so an automation can tell you the washing machine is done. An old fridge or a pool pump drawing more than it used to is often the first sign it needs a service.
Getting started
1
Start with what you want to know Start here
One appliance, or the whole house? A single circuit you can reach in the wall is an EM Mini Gen4 job. The EM Gen3 clamps up to two circuits, or the mains of a single phase house. For something more substantial that lives in your switchboard, look at the Pro range, which clips onto the DIN rail.
2
Add more as you go Then
Each meter works independently, so you can start with a single circuit and add more as you need them. They don't need to match: mix models and generations, and they sit side by side in the Shelly app or Home Assistant.
What's in the box
- 1× Shelly Pro 3EM-3CT63 energy meter
- Three phase, DIN rail mount
- 1× Shelly 3CT63 combined current transformer
- Fits over the circuit breaker and measures all three phases, up to 63 A
Works with
Also works with
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Pairs with Amazon Alexa
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Pairs with Google Home
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Pairs with Home Assistant
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Pairs with SmartThings
Connects over
On Wi-Fi or Ethernet
Joins your home network, so you control it from the app with no hub or bridge.
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Ethernet
-
Wi-Fi
Set up over Bluetooth
Used once, to get it onto your Wi-Fi.
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Bluetooth
Works offline
Keeps working on your home network when the internet is down.
Scripts
4
Give it jobs the app can't
Scripts add jobs the meter can't do with the Shelly app's schedules and actions alone, like acting on the weather forecast or sending an alert to your phone. Each one is a small program that runs on the meter itself: copy it, paste it into the device's script editor and press Start. It doesn't need a hub, a cloud account or a subscription.
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Garden Frost alert on your phone the evening before a cold night -
Notifications Phone alert when a Shelly goes offline -
Network Phone alert when your home's public IP address changes -
Notifications Phone message when the power comes back, with how long it was off
Scripts are free; installing one takes about two minutes.
Specifications & Installation
Setup · 2:34
How to install it
Shelly's install walkthrough for the Pro 3EM-3CT63, from DIN rail mounting to fitting the current clamps.
Watch setup videoNo specifications match.
Power
- Power
- Hardwired
- Standby power
- < 3 W
- Phases
- Single-phaseThree-phase
- Channels
- 3 channels
- Measured by
- CT clamp
- CT opening
- 9 mm
- CT clamps included
- Yes
- Accuracy (±)
- 1 %
- On-device history
- 60 days
- Relay output
- No
- Power supply
- 100-260 V~ 50/60 Hz
- External protection
- Tripping characteristic B or C, 16A max. rated current, min. 6 kA interrupting rating, energy limiting class 3
- Shelly 3CT63 electrical strength
- 1000 V~, 60 sec
- Form
- DIN-rail
- Housing material
- Plastic
- Standard
- 802.11 b/g/n
- Range (indoors)
- 30 metres
- RF band
- 2400 - 2495 МHz
- Max. RF power
- < 20 dBm
- Version
- 4.2
- Range (indoors)
- 10 metres
- RF band
- 2400 - 2483.5 MHz
- Max. RF power
- < 4 dBm
- Operating temperature
- -20–40 °C
- Operating humidity
- 30–70 % RH
- Max altitude
- 2000 metres
- Size (HxWxD)
- * Shelly Pro 3EM-3CT63: 94x19x69 mm / 3.70x0.75x2.71 in * Shelly 3CT63: 14x54x26 mm / 0.55x2.12x1.02 in
- Weight
- * Shelly Pro 3EM-3CT63: 62 g / 2.19 oz * Shelly 3CT63: 32 g /1.12 oz
- Screw terminals max torque
- 0.4 Nm / 3.5 lbin
- Conductor cross section
- * Shelly Pro 3EM-3CT63: 0.5 to 2.5 mm² / 20 to 14 AWG * Shelly 3CT63: 0.2 to 2.5 mm² / 24 to 14 AWG (solid, stranded, and bootlace ferrules)
- Conductor stripped length
- 6 to 7 mm / 0.24 to 0.28 in
- Mounting
- * Shelly Pro 3EM-3CT63: DIN rail * Shelly 3CT63: Freestanding on phase wires
- Conductor aperture Shelly 3CT63
- Ø9 mm / Ø0.35 in
- Shell color
- White
- Internal-temperature sensor
- Yes
- Voltmeter (AC)
- 100 - 260 V
- Voltmeter accuracy
- ±1 %
- Ammeter (AC)
- 0 - 63 A
- Ammeter accuracy
- ±1 % (2 - 63 A), ±2 % (1 - 2 A), ±5 % (0 - 1 A)
- Compatible current transformers
- 3CT63
- Power and energy meters
- * Active and apparent power * Active and apparent energy * Power factor * Fundamental active and fundamental reactive energy
- Channel-to-channel calibration minimum load
- 500 W per channel
- No load threshold
- 30 VA per channel
- Measurement data storage
- At least 60 days of 1 min data resolution
- Data export
- * CSV for PQ recorded values * JSON format export through RPC
- CPU
- ESP32-D0WDQ6
- Flash
- 16 MB
- Webhooks (URL actions)
- 20 with 5 URLs per hook
- Scripting
- Yes
- MQTT
- Yes
- Scripting
- Yes
- Encryption
- Yes
- SKU
- SHE-SNS-0004
Common questions
Quick answers before you buy. We test this gear ourselves. Can't find yours? Ask our Melbourne team
Yes. The 3CT63 in the name is the set of three 63 A clamps, with a 9 mm conductor aperture, one per phase.
Yes. It handles single-phase and three-phase installations, so a single-phase house can use it to watch three separate circuits instead of three phases.
Not on its own. It has no built-in relay. Contactor control takes the Shelly Pro 3EM Switch Add-on, which clips onto it on the DIN rail.
At least 60 days at one-minute resolution, stored on the device itself. A real-time clock keeps the timestamps right through a network outage.
Yes. It mounts in the switchboard with clamps around live conductors, which is a job for a licensed electrician in Australia. A whole-house meter is usually a single visit.
Shelly · Pro 3EM-3CT63 Energy Meter