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Eastron SDM120CTM vs Eastron SDM72D-M

Install fit
Phase support Single-phase 1P+N / 1P2W AC system. Single-phase two-wire (1P2W) and three-phase four-wire (3P4W); 100-277 V L-N or 100-480 V L-L, 50/60 Hz.
Installation Indoor one-module 18 mm CT-operated meter for 35 mm DIN rail in a dry enclosure; IP51 and CAT II context; qualified-person installation. Indoor 72 mm / four-module DIN-rail direct connection; default top-in/bottom-out wiring.
Measurement CT-operated RMS multifunction meter for voltage, current, power, power factor, frequency, demand, and bidirectional energy via pulse and RS485 Modbus RTU. True-RMS 1P2W/3P4W voltage, current, power and bidirectional import/export energy measurement.
Max current 9999 A 100 A
Meter fit
Accuracy class Class 1.0 active energy; Class 2 reactive energy. Class B is MID-version only. Active energy Class 1.0 / Class B; reactive energy Class 2; MID certified.
Current sensing External CT input: selectable 1 A or 5 A secondary, 0.25-5(6) A meter input, configurable 1-9999 A primary. MID versions lock the CT ratio after first setup. Direct-connected whole-current meter; no external CTs required.
Monitoring
Protocol RS485 Modbus RTU / pulse output RS485 Modbus RTU / pulse output
Local API Yes Yes
Cloud dependency No vendor cloud required; readings are available locally through RS485 Modbus RTU and pulse outputs. No vendor cloud required; local readings are available through RS485 Modbus RTU and pulse outputs.
Home Assistant Yes Yes
Solar fit
Solar import/export Yes Yes
Buying context
Availability Global Eastron product range; distributor stock, CT package, certification, and variant availability vary by market. Global Eastron product range; certification, stock, and suffix availability vary by market.
Source check
Last verified Aug 29, 2026 Aug 26, 2026
Product page Official page Official page
Documentation Official docs Official docs
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