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Carlo Gavazzi EM540DINAV23XS1X vs Carlo Gavazzi EM511DINAV81XS1PFB

Install fit
Phase support 2P 3-wire, 3P 3-wire, 3P+N 4-wire, and 3P 4-wire delta; 120-240 V L-N / 208-415 V L-L; 50/60 Hz. Single-phase two-wire, 230 V L-N at 50 Hz (MID PFB variant).
Installation Indoor 3-module DIN-rail direct-connected installation by a qualified electrician; IP40 front and IP20 terminals inside a suitable panel. Indoor 1-module (18 mm) DIN-rail switchboard installation; direct line-and-neutral wiring by qualified personnel.
Measurement Direct-connected multiphase TRMS measurement with separate imported/exported active and reactive energy, per-phase values, demand and THD. Direct-connected TRMS measurement with separate imported and exported active energy; on the PFB variant, total kWh+ and kWh- are the MID-certified registers.
Max current 65 A 45 A
Meter fit
Accuracy class Class 1 active energy; Class 2 reactive energy; exact X SKU is non-MID Class 1 active / MID Class B; Class 2 reactive
Current sensing Direct connection 5(65) A; no external current transformer Built-in direct current path, 0.25 A minimum, 5 A base and 45 A maximum; 0.02 A start-up current; no external CT.
Monitoring
Protocol RS-485 Modbus RTU RS-485 Modbus RTU
Local API Yes Yes
Cloud dependency No vendor cloud is required; display, keypad configuration, UCS software, and RS-485 Modbus RTU provide local operation and data access. No vendor cloud is required for metering or configuration; data is available locally on the display and through RS-485 Modbus RTU.
Home Assistant Yes Yes
Solar fit
Solar import/export Yes Yes
Buying context
Availability Global Carlo Gavazzi product range with localized product and sales channels; exact SKU carries CE, cULus, and UKCA approvals, while stock and suitability vary by market. Global localized Carlo Gavazzi catalogues; exact PFB model is MID-certified, with UKCA/local approval and availability to be verified by country.
Source check
Last verified Sep 8, 2026 Sep 16, 2026
Product page Official page Official page
Documentation Official docs Official docs
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