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Eastron SDM120CTM vs Eastron SDM72CT-M

Energy Meter

Eastron SDM120CTM

Energy Meter

Eastron SDM72CT-M

Decision point	Eastron SDM120CTM	Eastron SDM72CT-M

Install fit
Phase support	Single-phase 1P+N / 1P2W AC system.	3P4W on current product page; V1.2 manual also documents 1P2W and 3P4W measurement.
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 4-module 35 mm DIN-rail CT-operated panel installation; 72 x 100 x 66 mm, IP51 and CAT III. Professional wiring and correctly rated CTs are required.
Measurement	CT-operated RMS multifunction meter for voltage, current, power, power factor, frequency, demand, and bidirectional energy via pulse and RS485 Modbus RTU.	CT-operated RMS electrical parameters plus bidirectional active/reactive import-export energy; pulse outputs and local RS485 Modbus RTU.
Max current	9999 A	9999 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.
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.	External CT inputs with configurable 1-9999 A primary and 1 A or 5 A secondary. The 9999 A value is the CT-primary programming ceiling, not direct current through the meter.
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 RS485 Modbus RTU and pulse outputs are available through compatible hardware.
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 and inquiry channels; exact CT package, certification, stock and distributor availability vary by market.
Source check
Last verified	Aug 29, 2026	Aug 28, 2026
Product page	Official page	Official page
Documentation	Official docs	Official docs