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The Eastron SDM120CT-Modbus is a compact, multifunction single-phase energy meter designed for accurate electrical energy monitoring using an external current transformer (CT).
Featuring an RS485 Modbus RTU communication interface, two pulse outputs and a backlit LCD display, the SDM120CT-Modbus is an ideal solution for energy management, industrial automation, building monitoring, photovoltaic installations and sub-metering applications.
Unlike direct-connected electricity meters, the SDM120CT-Modbus measures current through a compatible external CT, allowing the monitoring of higher-current electrical circuits without passing the full load current directly through the meter.
The meter supports bidirectional energy measurement, making it suitable for monitoring both imported and exported electrical energy, including applications involving solar photovoltaic systems.
It measures a wide range of electrical parameters, including active energy (kWh), reactive energy (kvarh), active power (W), reactive power (var), apparent power (VA), voltage (V), current (A), power factor, frequency (Hz) and maximum demand.
The integrated RS485 Modbus RTU interface enables communication with compatible PLCs, industrial controllers, energy management platforms, building management systems (BMS) and data acquisition equipment.
Additionally, the meter provides two pulse outputs, including a configurable output and a second output specified at 1,000 impulses/kWh, enabling integration with compatible pulse-counting systems.
The backlit LCD display allows users to view electrical measurements directly on the device, while its compact 18 mm, single-module DIN rail design simplifies installation inside electrical distribution boards.
The SDM120CT series is available in versions conforming to the MID 2014/32/EU directive, with Class B active energy accuracy, making appropriately certified versions suitable for applications requiring regulated energy measurement.
With its combination of CT-based measurement, Modbus communication, bidirectional monitoring and compact construction, the Eastron SDM120CT-Modbus provides a flexible solution for modern electrical energy monitoring systems.
Important: The SDM120CT-Modbus requires a compatible external current transformer. The CT is not assumed to be included. Confirm the exact CT secondary input (1A or 5A), nominal voltage and MID-certified ordering variant before purchase.
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🔑 Key Features
⚡ Single-Phase Energy Monitoring – Measures electrical energy and power in single-phase installations.
🔄 Current Transformer (CT) Operated – Supports indirect current measurement using a compatible external CT.
📡 RS485 Modbus RTU Communication – Integrates with compatible PLCs, BMS and energy management systems.
📊 Multi-Parameter Measurement – Measures kWh, kvarh, W, var, VA, V, A, power factor, frequency and demand.
↔️ Bidirectional Energy Measurement – Monitors imported and exported energy.
🏅 MID Class B Accuracy – MID-certified variants support regulated active energy measurement.
🎯 Class 1 Active Energy Accuracy – According to the published measurement specifications.
🔌 Dual Pulse Outputs – Configurable pulse output plus 1,000 imp/kWh output.
🖥️ Backlit LCD Display – Clear visualization of measured electrical parameters.
📐 Compact DIN Rail Design – Single-module, 18 mm width.
⚙️ Configurable CT Ratio – Supports compatible CT ratios for different electrical installations.
🏭 Industrial & Building Integration – Suitable for energy monitoring and automation applications.
☀️ Solar PV Monitoring – Supports bidirectional measurement for import/export monitoring.
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🛠 Applications
🏢 Building Energy Management – Monitor electricity consumption in commercial and residential installations.
🏭 Industrial Energy Monitoring – Measure energy use in electrical circuits and equipment.
☀️ Solar PV Installations – Monitor imported and exported electrical energy.
⚡ Electrical Distribution Boards – Add compact energy monitoring to DIN rail installations.
🏬 Tenant Sub-Metering – Monitor energy consumption in separate areas or circuits, subject to applicable metering requirements.
📊 Energy Management Systems (EMS) – Integrate measurements using RS485 Modbus RTU.
🏠 Building Management Systems (BMS) – Supply electrical measurements to compatible automation platforms.
🔧 Industrial Automation – Connect energy monitoring to PLCs and data acquisition systems.
🌍 Energy Efficiency Projects – Track consumption trends and support energy optimization.
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📦 Package Includes
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1 × Eastron SDM120CT-Modbus Single Phase Energy Meter
Not included : external current transformer (CT), RS485 communication cable, data logger, Modbus gateway or energy management software.
The exact supplied version and accessories should be confirmed against the supplier's order confirmation.
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📥 Product Downloads
📄 Eastron SDM120CT Series Datasheet (PDF)
- Manufacturer: Eastron
- Model: SDM120CT-Modbus
- Product Type: Single Phase Multifunction Energy Meter
- Measurement Connection: Current Transformer (CT) Operated
- Electrical System: Single Phase, 2-Wire (1P+N)
- Nominal Voltage: 120V or 230V AC, Depending on Variant
- Operating Voltage: 80%-120% of Nominal Voltage
- Frequency: 50/60 Hz
- CT Secondary Input: 1A / 5A, Depending on Variant
- CT Primary Range: Configurable; Refer to Selected CT Variant
- Measured Parameters: kWh, kvarh, W, var, VA, V, A, Power Factor, Frequency, Demand
- Energy Measurement: Bidirectional Import / Export
- Active Energy Accuracy: Class 1 / Class B
- Reactive Energy Accuracy: Class 2
- Voltage / Current Accuracy: 0.5% (Published Specification)
- Communication Interface: RS485
- Communication Protocol: Modbus RTU
- Modbus Address Range: 1-247
- Modbus Baud Rates: 1200, 2400, 4800, 9600, 19200 bps (Verify Firmware Variant)
- Pulse Outputs: 2
- Pulse Output 1: Configurable
- Pulse Output 2: 1000 imp/kWh
- Display: Backlit LCD
- Mounting: DIN Rail
- Module Width: 18 mm (1 Module)
- Dimensions: Approx. 118 x 18 x 64 mm (Series Datasheet)
- Ingress Protection: IP51, Indoor Installation
- Operating Temperature: -25°C to +55°C (Series Datasheet)
- Operating Humidity: Up to 90% RH, Non-Condensing
- MID Compliance: 2014/32/EU, Certified Variants
- External CT: Required; Not Assumed Included