Energy consumption monitoring over modbus RTU RS485

Energy Meter with External CT — Modbus RS485, Single and Three Phase

The SEMSPME is a Modbus RS485 RTU energy meter with an external current transformer. The external CT clamps around the live conductor without breaking the circuit — making it the right choice for high-current loads and retrofit installations where the existing wiring cannot be modified. Available in single phase and three phase.

External CT — High Current, Easy Retrofit

An external CT installs by clamping around the existing cable — no need to disconnect, cut, or re-terminate the live conductor. This makes the SEMSPME ideal for existing installations and for loads above what an internal CT can handle. Current rating depends on the CT selected; high-current variants are available for industrial and distribution applications.

Variant Selection Guide

Phase

• Single Phase (SP) — single-phase loads, distribution panels, individual machines
• Three Phase (TP) — three-phase industrial loads, motors, DG sets, transformers

Connectivity

• Modbus only — RS485 Modbus RTU; integrates with any existing SCADA, BMS, or Modbus master
• Modbus + WiFi — direct WiFi cloud push with RS485 output retained
• Modbus + WiFi + LoRa — full stack for campus or building-wide metering networks

Use Cases

• Industrial energy monitoring — machine-level and feeder-level consumption tracking on factory floors
• Distribution transformer monitoring — clamp CT on HT/LT panel feeders for zone-level visibility
• DG set and UPS metering — monitor backup power consumption without modifying the existing circuit
• Commercial building sub-metering — floor-level or tenant-level metering in large buildings
• Retrofit installations — add energy monitoring to existing panels without downtime or rewiring

Key Specifications

• CT type: External — clamp-on, no circuit interruption needed
• Phase: Single phase (SP) and three phase (TP)
• Output protocol: Modbus RS485 RTU (all variants)
• Connectivity options: Modbus only | Modbus + WiFi | Modbus + WiFi + LoRa
• Readings: kWh, voltage, current, power factor, frequency