Shelly Pro 3EM-3CT63

[Heinz]

Shelly Pro 3EM-3CT63 

 

DIN rail mountable single or three-phase energy meter

Shelly Pro 3EM-3CT63 is a DIN rail mountable single or three-phase energy meter. It comes with a combined 3-phase current transformer (CT) that is designed to be mounted directly over a circuit breaker. Shelly Pro 3EM-3CT63 measures energy use accurately and can be used in many settings, such as monitoring industrial machines, saving energy in homes or offices, and managing electrical loads.

*NOTICE! This device does not have a built-in relay. Contactor control is provided using a Shelly Pro Addon attached to the Shelly Pro 3EM-3CT63.

• 4 Quadrant measurement
• DIN rail mounting
• Multiple connection types: Three-phase or single-phase installations
• Current transformer connection: Non-contact measurements.
• Optical pulse indication of energy usage
• Real-time clock: Stored data keeps correct timestamps even if the internet connection is interrupted. ***
• Data logs: Up to 60 days of data stored on the device for later retrieval
• External contactor control: Loads can be controlled based on device automation or scripts. Available with the addition of the Shelly 3EM Switch Add-on
• Photovoltaic ready
• Supports KNXnet / IP communication

Main Application 

• Residential
• MDU (Multi-Dwelling Units - apartments, condominiums, hotels, etc.)
• Light commercial (small office buildings, small retail/restaurant/gas station, etc.)
• Government/Municipal
• University/college

For more information see below 
Home Page    Specifications     Buy Shelly Pro 3EM-3CT63

[Chriss]

Hello, is the basic module identical to the PRO 3EM, just with the other measuring terminal (3CT63)? Can I also get this smaller measuring terminal separately?

[Heinz]

Currently, I am not sure if you can get the 3CT63 terminal separately but will know more once the device is in full production. For now its safe to say this the device comes with a sensor.

[usul27]

Any idea when this will become available? I need to install a new meter and this one would fit well.

[Gvzdus]

I ordered mine on 28.09. and integrated it today. Looks like the first batch of devices was sold fast.

And yes, this new size is helpful, if you compare it to the fat clamps.

 

[Heinz]

awsome thanks for the update looks much better and more clean with the smaller clamp 

[R4S6]

On 24.9.2024 at 23:13, Chriss said:

Hello, is the basic module identical to the PRO 3EM, just with the other measuring terminal (3CT63)? Can I also get this smaller measuring terminal separately?

Exactly the questions coming into my mind at my first glance to this Device.

I have 3x Shelly pro 3EM in my drawers. The CT size is too big or my braker box is too tight. If the 3-phase CT of Shelly 3EM 3CT63 is compatible to the "old" device and I can get 3 of them as a kind of spare part the 3 devices would finally be installed and not longer lay in the drawer.

[Just Vodka]

Hi, I have received my Pro 3em 3ct63.  (already got the 120a a couple of weeks before the 3ct63 was released and the clamps of that one are way to big to fit in my installation)
But I have got a couple of questions before installing the 3ct63.
 

1. the CT has Grid "K" coming in from the top to the home "L". In my house the grid comes in from the bottom, does the software have the option to reverse the load? So instead of treating it sending it to the grid (negative value) make it positive?
2. For the Pro 3em 120A the individual CT clamps are labeled A, B, C and are calibrated for the respective connectors on the 3em unit. On the 3ct63 the individual connectors/holes are not labeled with A, B or C. Does this mean the individual connectors are not calibrated to specific ports? So if question 1 is not an option I can install the 3ct63 CT upside down and connect it as C, B, A? (the middle one always be B and just swap A and C around)

Edited October 29, 2024 by Just Vodka

[thgoebel]

1. The direction may be adopted to the physical situation with „settings“ menu:

This menu is available with the Home Screen:

2. As with the single 50A or 120A current transformers, the voltage path at terminals A, B or C of the Shelly must correspond with the current path (plugs IA, IB or IC). For an incorruptible test, proceed as shown in this picture:

Execute this check for each phase/current clamp!

Edited October 30, 2024 by thgoebel

[Just Vodka]

Thank you @thgoebel I've got a follow up question:
1. With reverse CT measurement direction enabled. Would that also apply to the values I would read out with Home Assistant?

 

[thgoebel]

Don’t use Home Assistant, but this should include the values sent to HA.

[Robert Klauco]

On 9/30/2024 at 4:52 PM, Heinz said:

Currently, I am not sure if you can get the 3CT63 terminal separately but will know more once the device is in full production. For now its safe to say this the device comes with a sensor.

Hello, Heinz. Any update on this? I'd get few of them - would clean up my distribution box quite a lot 🙂

[Heinz]

7 minutes ago, Robert Klauco said:

Hello, Heinz. Any update on this? I'd get few of them - would clean up my distribution box quite a lot 🙂

from my last checks it only comes with the device, and would not be sold separately. 

[Robert Klauco]

That's unfortunate - as I already have the device and see no need to replace it, it would be just cosmetic replacement for me 😞 Too bad...

[Heinz]

i fully understand sorry for the bad news 

[terae]

4 hours ago, Heinz said:

from my last checks it only comes with the device, and would not be sold separately. 

 

I'm 100% sure it's coming. It's different thing how soon... @Dimitar When it will come available to order separately?

 

[If_then_else]

@terae

I think it's good when one of the moderators takes note of the small or large pains of the users and pushes it internally for further evaluation.

Thank you very much.

[terae]

54 minutes ago, If_then_else said:

@terae

I think it's good when one of the moderators takes note of the small or large pains of the users and pushes it internally for further evaluation.

Thank you very much.

Well, about the internal, I'm just like half in. How ever couple of years with Shelly has taught something.

I have here in Finland many clients waiting for that 3x63A CT to come available as spare/replace part to be used with earlier bought Pro 3EM-120. The latest FW have already (as seen) program support to have that used with them. Downgrade to 50A CT's is already available from distributors.

Dimitar and product owners sure does know a lot more about reasons of delays and why it's not yet "launched" to be sold as spare part like thing. Just keep reminding 'em to have things happen some day... that's one of the things to be done, just like to have already Pro version of 50A and 120A and 400A CT's available as individual parts.

PS. I have personally sold 882 old 50A CT's this year yet. As sets of 3 to something non-Shelly use; those are interchangeable to some other applications too. The 3x63A version could possibly sell also to non-Shelly applications if tech specs known good enough. Shelly has very competitive pricing to these. All sales counts.

[stratomnaut]

Peak current and current transformer characteristics.

I'd like to use if for a heat pump, but there I'm using characteristic c fuses of 25A, so the worst case current could be above 63A. Are the 63A referring to the measurement range and higher currents would not be detected but do no harm. Or would higher inrush currents cause permanent damage to the shelly?

I also noticed that the link to details about the current transformer in the specification table (https://shellyusa.atlassian.net/wiki/spaces/3EM3T63/pages/685342793/Shelly+3CT63+main+page) on the page https://www.shelly.com/products/shelly-pro-3em-3ct63 does not work due to access restrictions.

Could you eventually share that?

Edited November 7, 2024 by stratomnaut
clarify link location

[thgoebel]

Current through the clamp exceeding the upper limit will be not harmful for both the Shelly and the clamp. Each current transformer has an integrated bipolar TVS diode which limits the voltage if current transformer is not plugged in the Shelly. In this case the burden resistance (mounted in the Shelly) is not effective.

The second failure mechanism would be a current overload: Shelly pro 3EM has an internal burden resistance of 12Ω. At rated current (120A) this produces a voltage of 480mV over the burden resistor. This produces a power dissipation of 20mW. A three-fold higher current (360A) will cause a power dissipation of 60mW at a voltage of less than 1,5V over the burden. The „Energy Meter“ IC ADE7880 will tolerate such an overvoltage.

Conclusion: Current through the clamp exceeding the rated current is not an issue!

Edited November 14, 2024 by thgoebel

[Just Vodka]

Another question..
The page says "combined 63A"
Does that mean 3x21A max for a 63A total combined? Or 3x63A For a 189A total? 

[thgoebel]

Each of the three channels measures up to 63A.

[Just Vodka]

Thank you @thgoebel
I do think it can be clarified in the specs and/web page.  since "combined 63A" can be interpreted in multiple ways.

[ophidian]

what is the sampling rate?