Device Overview

The Eastron SDM630M-DI is a direct-connected DIN-rail multifunction energy meter for single-phase and three-phase AC systems. It is useful where a project needs a conventional electrical-panel meter with RS485 Modbus RTU, pulse outputs, and digital input context rather than an app-first home monitor.

The device is especially relevant for EV charging metering, commercial sub-metering, solar import/export visibility, and installer-led panel monitoring. Eastron's official page positions the SDM630M-DI as a 4-module meter with 1P2W, 3P3W, and 3P4W support, bidirectional energy measurement, 2 digital inputs, and RS485 Modbus communication.

Core Characteristics

The SDM630M-DI is a whole-current meter, so it can be wired directly up to its published 100 A maximum current without external CTs. That makes it different from CT-operated meters such as SDM630MCT variants, where the maximum measurable current depends on selected current transformers.

It measures imported, exported, and total energy, plus common electrical parameters such as voltage, current, frequency, active power, apparent power, reactive power, and power factor. The official source lists Class 1 / Class B active-energy accuracy and Class 2 reactive-energy accuracy.

Installation And Compatibility

This is an installer-installed DIN-rail device for a panel, switchboard, or EV-charger cabinet. It is not a plug-in monitor. Buyers should confirm the wiring system, certification variant, and local distributor availability before specifying it for a project.

For local integrations, the key interface is RS485 Modbus RTU. That can fit building-management systems, EV-charger controllers, gateways, data loggers, and Home Assistant installations that use compatible RS485 hardware and the generic Modbus integration. The Home Assistant fit is therefore standards-based, not an Eastron-native cloud integration.

Best Fit

Choose this meter when the project needs a direct-connected 100 A single/three-phase Modbus meter with digital inputs and import/export data. For higher-current services, a CT-operated SDM630MCT-family meter is usually the more appropriate comparison. For app-first home monitoring, a consumer CT monitor may be easier to install and operate.