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Carlo Gavazzi EM540 vs Acrel ADL400

Install fit
Phase support 2-phase 3-wire; 3-phase 3-/4-wire including wild-leg; 120-240 V L-N, 208-415 V L-L, 45-65 Hz. Three-phase three-wire and three-phase four-wire systems.
Installation Indoor 3-DIN DIN-rail direct-connected energy analyzer for low-voltage switchboards. Indoor 4-module (72 mm) DIN-rail installation by a qualified electrician; the ADL400 family documents direct-connected and external-CT wiring variants.
Measurement Direct TRMS bidirectional active/reactive/apparent energy and power, demand, PF, frequency, and current/voltage THD to the 15th harmonic; non-MID XS1X. Three-phase 3P3W/3P4W electrical-parameter, 1st-31st harmonic, and bidirectional active/reactive energy measurement over local RS485 Modbus RTU.
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; MID/CE listed.
Current sensing Direct 5(65) A input; 0.25 A minimum and 20 mA start-up current; no external CT. Two documented input variants: 3 x 10(80) A and 3 x 1(6) A, with separate direct-connect and external-CT wiring diagrams; confirm the ordered input variant.
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 Oct 3, 2026 Sep 5, 2026
Product page Official page Official page
Documentation Official docs Official docs
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