The Eastron SDM630 Energy Meter delivers multi-parameter electrical monitoring, Class 1 / Class 0.5S accuracy, and flexible digital telemetry engineered specifically for commercial sub-metering, industrial motor control centers (MCC), solar photovoltaic generation, and building management systems (BMS).

Advanced Power Analysis with the Eastron SDM630 Energy Meter

Designed for compact electrical distribution panels, the Eastron SDM630 Energy Meter measures and displays a complete suite of power quality variables across single-phase and three-phase electrical grids. Capable of handling both direct connection loads up to 100 A and standard 1A/5A current transformer (CT) inputs, the instrument provides accurate tracking of line-to-line voltages, phase currents, active power (kW), reactive power (kvar), power factor, frequency, and total harmonic distortion (THD).

The unit features bidirectional four-quadrant energy measurement, making it ideal for renewable solar energy feed-in systems and battery energy storage applications where imported and exported energy must be tracked separately. Its high-contrast backlit LCD screen provides clear numerical readouts across dimly lit switchrooms, while tactile front touch buttons allow technicians to cycle through real-time phase readings and configure CT/PT ratios without specialized programming software.

For seamless integration into automated meter reading (AMR) networks and SCADA platforms, the device includes an optically isolated RS485 serial port communicating via open Modbus RTU protocol. In addition to digital serial telemetry, two pulse outputs are provided for real-time proportional active and reactive energy pulsing into external data loggers and legacy PLC digital input cards.

Key Features and Engineering Advantages

• Multifunction Electrical Monitoring: Tracks over 30 electrical variables including bidirectional active/reactive energy, power demand, frequency, and phase balance.
• Direct and CT-Operated Flexibility: Available in direct-feed models up to 100 A or external CT-operated variants with programmable primary current ratios.
• Four-Quadrant Energy Registration: Accurately differentiates between import and export kWh/kvarh for solar net-metering and local generation loops.
• Isolated Modbus RTU Communication: Enables remote supervisory monitoring, real-time logging, and cloud data aggregation via standard RS485 wiring.
• Compact 4-Module DIN Mounting: Slim 72 mm footprint snaps directly onto 35 mm DIN rails, maximizing space efficiency inside electrical panels.

Technical Specifications

Industrial Applications and Process Integration

The Eastron SDM630 Energy Meter is widely deployed across commercial, utility, and heavy manufacturing installations, including:

• Commercial tenant billing, shopping mall sub-metering, and data center rack power distribution.
• Industrial motor control centers (MCC), pump stations, and air compressor electrical tracking.
• Solar photovoltaic inverter export monitoring and electric vehicle (EV) charging station load balancing.
• Facility energy management systems (EMS) focused on ISO 50001 corporate energy auditing.

Frequently Asked Questions

What is the difference between the direct-connect SDM630 and the SDM630-MCT?
The direct-connect Eastron SDM630 Energy Meter handles electrical branch currents up to 100 A directly through its internal heavy-duty terminal blocks. The SDM630-MCT variant is designed to accept inputs from external 1 A or 5 A current transformers (CTs), allowing it to monitor high-power main incomers and busbars rated up to several thousand amperes.

Can the meter record solar photovoltaic export and import energy separately?
Yes. The SDM630 features bidirectional four-quadrant energy registers. It continuously measures both forward (imported) and reverse (exported) active energy, allowing solar installations and net-metered sites to precisely track total grid feed-in and consumption.

How is the RS485 communication line terminated in multi-drop daisy chains?
The RS485 port connects via two-wire shielded twisted-pair cabling. When connecting multiple meters along a Modbus trunk line, each device must be assigned a unique bus ID (1 to 247), with a 120-ohm terminating resistor placed across the A and B communication lines on the final unit to prevent signal reflections.