Energy Meter Eastron SDM72CT-M RS485 Modbus RTU / pulse output

Eastron SDM72CT-M

A CT-operated three-phase DIN-rail Modbus energy meter for switchboards that need import/export energy, configurable CT ratios, and local RS485 data without a vendor cloud.

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Source Checked

Checked for product fit and source-backed specs

Editorial policy

Last reviewed

Jun 27, 2026

Source checked

Jun 27, 2026

Official references

Verified 2026-06-27 CST against Eastron official SDM72CT-M product page, SDM72CT-M/MV/M-2T datasheet, SDM72CT-M user manual, official product/wiring images, and Home Assistant Modbus documentation. Energy-meter only: CT-operated 3P4W meter, DIN-rail mounting, RS485 Modbus RTU plus pulse output, configurable 1-9999 A CT primary with 1 A/5 A CT secondary, Class 1.0 / Class B active energy, Class 2 reactive energy, import/export energy, local Modbus access, and standards-based Home Assistant Modbus fit.

What matters for buyers

Installation fit, electrical context, and whether the device suits the home it is being considered for.
Monitoring quality, local-versus-cloud data access, and platform compatibility.
Unknown specs stay blank rather than being guessed.

Editorial stance

Manufacturer documents can support source checks, but recommendations stay based on homeowner fit and practical trade-offs.

Device Overview

The Eastron SDM72CT-M is a CT-operated three-phase DIN-rail Modbus energy meter for switchboards where the installer needs flexible current-transformer sizing and local data access.

Why The New Fields Matter

For comparison, the key points are that this is an energy-meter, not an inverter, battery, EV charger, or gateway. It uses external CTs, supports 3P4W systems, reports import/export energy, and exposes local RS485 Modbus RTU data.

Installation And Connectivity

The meter mounts on a 35 mm DIN rail, uses 1 A or 5 A CT secondary inputs, and supports configurable CT primary values up to 9999 A. Core readings do not require vendor cloud access. Home Assistant compatibility is best understood as a standards-based Modbus integration through suitable RS485 hardware.

Buying Notes

Eastron's official product page provides specifications, images, PDF download, and inquiry/contact routes. Distributor availability, CT bundle, certification, and pricing should be checked by region.

Product Images

Gallery, diagrams, and supporting visuals.

Eastron SDM72CT-M official product image — Official Eastron product image for the SDM72CT-M CT-operated three-phase Modbus energy meter.

Eastron SDM72CT-M wiring diagram — Official Eastron wiring diagram showing CT inputs and RS485 terminals for the SDM72CT-M.

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Phase support: Three-phase four-wire 3P4W / 3 x 230(400) V AC system.
Installation: Indoor 4-module 35 mm DIN-rail mounted CT-operated three-phase meter for switchboards.
Measurement: CT-operated three-phase 4-wire multifunction energy meter with RS485 Modbus RTU import/export energy measurement.
Max current: 9999 A
Accuracy class: Active energy Class 1.0 / Class B; reactive energy Class 2.
Current sensing: External current transformers; CT primary configurable 1-9999 A with 1 A or 5 A CT secondary input.
Local API: Yes
Cloud dependency: No vendor cloud required; local RS485 Modbus RTU and pulse outputs are available through compatible hardware.
Home Assistant: Yes
Solar import/export: Yes
Availability: Global Eastron product range; distributor stock, CT package, and certification details vary by market.