Shelly 3EM PRO 120A Clamp

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The Shelly 3EM Pro with 120 A CT clamps is designed to cover a wide range of domestic and light commercial installations where the main incoming current can be up to 120 A per phase. While it’s true that in many standard single-phase Australian homes the neutral current rarely approaches 120 A, the higher-rated clamp ensures the device can monitor the full load range when measuring total household consumption or larger sub-boards.

If you’re after higher resolution and better accuracy at lower current levels, you absolutely can use lower-rated clamps with the 3EM Pro — such as 50 A CTs — and update the settings in the Shelly interface to match the clamp rating. This approach can give you more precise readings for smaller loads since the CT ratio is a closer match.

You can find more details about how Shelly meters and CT clamps work (including configuration and compatibility) in the official documentation here:
Shelly Knowledge Base – CT Clamps & Metering: https://kb.shelly.cloud/knowledge-base/?l=en

And you can view the range of Shelly power metering devices and accessories available on our site here:
https://www.ozsmartthings.com.au/