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Schneider Electric Acti9 iEM3155 vs Carlo Gavazzi EM540DINAV23XS1X

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