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Eastron SDM72D-M vs Eastron SDM120CTM

Install fit
Phase support 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. Single-phase 1P+N / 1P2W AC system.
Installation Indoor 72 mm / four-module DIN-rail direct connection; default top-in/bottom-out wiring. 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.
Measurement True-RMS 1P2W/3P4W voltage, current, power and bidirectional import/export energy measurement. CT-operated RMS multifunction meter for voltage, current, power, power factor, frequency, demand, and bidirectional energy via pulse and RS485 Modbus RTU.
Max current 100 A 9999 A
Meter fit
Accuracy class Active energy Class 1.0 / Class B; reactive energy Class 2; MID certified. Class 1.0 active energy; Class 2 reactive energy. Class B is MID-version only.
Current sensing Direct-connected whole-current meter; no external CTs required. 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.
Monitoring
Protocol RS485 Modbus RTU / pulse output RS485 Modbus RTU / pulse output
Local API Yes Yes
Cloud dependency No vendor cloud required; local readings are available through RS485 Modbus RTU and pulse outputs. No vendor cloud required; readings are available locally 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; certification, stock, and suffix availability vary by market. Global Eastron product range; distributor stock, CT package, certification, and variant availability vary by market.
Source check
Last verified Aug 26, 2026 Aug 29, 2026
Product page Official page Official page
Documentation Official docs Official docs
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