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Carlo Gavazzi EM540 vs Acrel ADL400

Install fit
Phase support 2-phase 3-wire; 3-phase 3-wire; 3-phase 4-wire; 4-wire delta / wild-leg. Three-phase three-wire and three-phase four-wire systems.
Installation Indoor 3-DIN DIN-rail direct-connected energy analyzer for low-voltage switchboards. DIN-rail mounted three-phase energy meter; direct and CT wiring variants are documented.
Measurement Direct consumption/generation and signed import/export measurement over local Modbus RTU; XS1X is non-MID. Three-phase Modbus energy meter measuring electrical parameters, active/reactive energy, and forward/reverse energy.
Max current 65 A 80 A
Meter fit
Accuracy class Class 1 active energy; Class 2 reactive energy; XS1X is non-MID. Active energy Class 0.5; reactive energy Class 2.
Current sensing Direct connection up to 65 A; no external CTs for the EM540DINAV23XS1X direct-connected model. Acrel documents 3 x 1(6) A and 3 x 10(80) A input-current variants, with direct-connect and CT wiring examples.
Monitoring
Protocol RS485 Modbus RTU RS485 Modbus RTU
Local API Yes Yes
Cloud dependency No vendor cloud required for core use; EM540DINAV23XS1X exposes local RS485 Modbus RTU data. No vendor cloud required for core metering; ADL400 exposes local RS485 Modbus RTU for SCADA, EMS, gateways, or automation systems.
Home Assistant Yes Yes
Solar fit
Solar import/export Yes Yes
Buying context
Availability North America, Europe and UK; XS1X carries cULus, CE and UKCA. Local stock varies. Global Acrel product range with direct quote/contact routes; local distributor availability and certification context vary by market.
Source check
Last verified Aug 25, 2026 Jul 21, 2026
Product page Official page Official page
Documentation Official docs Official docs
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