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Carlo Gavazzi EM540DINAV23XS1X vs Schneider Electric Acti9 iEM3155

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. 1P+N, 3P and 3P+N; 100-277 V L-N or 173-480 V L-L, 50/60 Hz
Installation Indoor 3-module DIN-rail direct-connected installation by a qualified electrician; IP40 front and IP20 terminals inside a suitable panel. Indoor 5-module (90 mm) DIN-rail direct-connected installation; IP40 front and IP20 body.
Measurement Direct-connected multiphase TRMS measurement with separate imported/exported active and reactive energy, per-phase values, demand and THD. Direct current, voltage and active/reactive power, plus signed four-quadrant active/reactive/apparent energy for multi-tariff and submetering use.
Max current 65 A 63 A
Meter fit
Accuracy class Class 1 active energy; Class 2 reactive energy; exact X SKU is non-MID Class 1 active energy; Class B active energy; MID certified
Current sensing Direct connection 5(65) A; no external current transformer Direct input, 0-63 A; no external current transformers
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 required for display, metering or local RS-485 Modbus RTU access; remote monitoring depends on a separate gateway, BMS or platform.
Home Assistant Yes Yes
Solar fit
Solar import/export Yes Yes
Buying context
Price range Unknown GBP 416.47 on Schneider Electric UK on 2026-10-14; regional list/transaction pricing, VAT, stock and delivery vary.
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. United Kingdom, EU/EEA, United States/Canada, Australia/New Zealand and other Schneider certification markets; ordering, price and stock vary by country.
Source check
Last verified Sep 8, 2026 Oct 14, 2026
Product page Official page Official page
Documentation Official docs Official docs
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