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Carlo Gavazzi EM24 vs Carlo Gavazzi EM540

Install fit
Phase support 1P2W, 3P3W, and 3P4W systems for the AV9 direct-connected model. 2-phase 3-wire; 3-phase 3-wire; 3-phase 4-wire; 4-wire delta / wild-leg.
Installation Indoor 4-DIN DIN-rail mounted direct-connected energy analyzer for low-voltage switchboards. Indoor 3-DIN DIN-rail direct-connected energy analyzer for low-voltage switchboards.
Measurement Direct-connected single/three-phase active and reactive energy analyzer with Modbus RTU and electrical-variable monitoring. Direct-connected two/three-phase energy analyzer for import/export active energy and electrical variables over Modbus RTU.
Max current 65 A 65 A
Meter fit
Accuracy class Active energy Class 1 / Class B MID; reactive energy Class 2. Active energy Class 1; Class B MID.
Current sensing Direct connection up to 65 A; no external CTs for EM24DINAV93XISX. Direct connection up to 65 A; no external CTs for the EM540DINAV23XS1X direct-connected model.
Monitoring
Protocol RS485 Modbus RTU RS485 Modbus RTU
Local API Yes Yes
Cloud dependency No vendor cloud required for core metering; local RS485 Modbus RTU access through compatible hardware or software. No vendor cloud required for core use; EM540DINAV23XS1X exposes local RS485 Modbus RTU data.
Home Assistant Yes Yes
Solar fit
Solar import/export Yes Yes
Buying context
Availability Carlo Gavazzi global product channels; country pages, certification, stock, and distributor availability vary by region. Carlo Gavazzi global product channels; stock, approvals, and distributor availability vary by country.
Source check
Last verified Jun 27, 2026 Jun 25, 2026
Product page Official page Official page
Documentation Official docs Official docs
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