Milesight CT305 LoRaWAN 500A Smart Current Transformer (EU868)

The Milesight CT305 is an advanced LoRaWAN Smart Current Transformer designed for wireless electrical current monitoring in commercial buildings, industrial facilities, electrical distribution panels and energy management applications.

With a rated measurement capacity of 500 A RMS per current transformer, the CT305 enables reliable monitoring of medium-to-high electrical loads without requiring conventional hardwired monitoring infrastructure.

Its innovative split-core clamp design allows current transformers to be installed around existing conductors without cutting the cables, providing a practical solution for retrofitting existing electrical installations.

The CT305 supports up to three independent current measurement channels, enabling the simultaneous monitoring of three electrical phases or separate circuits using a single LoRaWAN communication module.

This makes it particularly useful for monitoring three-phase distribution systems, industrial machinery, HVAC installations, pumping stations, UPS circuits and electrical loads across commercial and industrial buildings.

The device measures RMS current, with a sampling frequency of up to 3.3 kHz, ±1% measurement accuracy and 1 mA resolution.

In addition to instantaneous current measurements, the CT305 supports reporting of accumulated current data in ampere-hours (Ah), providing useful information for current usage trends and equipment operating patterns.

Unlike conventional battery-powered IoT sensors, the CT305 uses induced current power supply, harvesting operating energy from the monitored conductor.

This battery-free design reduces routine maintenance and eliminates battery replacement requirements.

For low-current applications where induced energy may be insufficient, the device also supports external 5V power via USB Type-C.

The CT305 operates on the EU868 LoRaWAN frequency band, supporting long-range wireless data transmission to compatible LoRaWAN gateways and network servers.

It supports OTAA and ABP activation, operates as a LoRaWAN Class A device, and can be integrated into compatible IoT monitoring platforms.

The CT305 also provides configurable current threshold alarms and overrange alarms, allowing the monitoring system to identify unusual current conditions, overloaded equipment and unexpected changes in electrical consumption patterns.

For enhanced monitoring, the device supports an external NTC cable temperature sensor, enabling temperature measurements from −20°C to +100°C when a compatible sensor is connected.

The communication module features a USB Type-C port for configuration, external power supply and compatible temperature sensor connectivity, as well as an LED indicator for operating status and alarms.

Firmware maintenance can be performed using the supported Firmware Update Over the Air (FUOTA) functionality.

With an IP30 protection rating, the CT305 is intended for suitable indoor installations, particularly within electrical cabinets and protected technical environments.

The CT305 provides a practical solution for electrical current monitoring, equipment status detection, predictive maintenance, load analysis and Industrial IoT applications.

Important: The CT305 directly measures RMS current and accumulated current. Compatible device versions can also calculate energy consumption using user-configured voltage and power factor values. Voltage and power factor are not measured directly. For applications requiring direct measurement of voltage, active power and electrical energy, select an appropriate energy meter.

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🔑 Key Features

⚡ 500A RMS Current Measurement – Measures electrical current up to 500 A per CT channel.

🔌 Up to 3 Independent Channels – Monitor three phases or separate electrical circuits.

📡 LoRaWAN EU868 Connectivity – Long-range wireless communication with compatible IoT networks.

🔋 Battery-Free Operation – Powered by energy induced from the monitored conductor.

🔌 Optional 5V USB-C Power – External power supply for low-current operating conditions.

🧲 Split-Core Clamp Installation – Non-invasive installation around existing electrical conductors.

🎯 ±1% Measurement Accuracy – Reliable current monitoring for operational applications.

📊 3.3 kHz Sampling Frequency – High-frequency sampling for accurate RMS current measurement.

📈 Accumulated Current Monitoring – Supports accumulated ampere-hour (Ah) reporting.

🔔 Current Threshold Alarms – Detect abnormal current levels and equipment operating conditions.

🚨 Overrange Alarms – Alerts when current exceeds the configured measurement range.

🌡️ Optional Cable Temperature Monitoring – Supports an external NTC sensor from −20°C to +100°C.

⚙️ Remote Configuration – Configure supported parameters using LoRaWAN downlinks.

🔧 USB Type-C Interface – Local configuration, optional power and compatible temperature sensor connection.

🔄 FUOTA Support – Firmware updates over the air.

📶 LoRaWAN Class A / OTAA / ABP – Compatible with standard LoRaWAN network infrastructure.

🛡️ IP30 Protection – Designed for protected indoor installations.

🏭 Industrial Current Monitoring – Suitable for machinery, distribution boards and industrial equipment.

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🛠 Applications

🏢 Commercial Building Energy Management – Monitor electrical current trends across building distribution systems.

🏭 Industrial Machinery Monitoring – Detect changes in equipment load and operating conditions.

⚡ Three-Phase Electrical Systems – Monitor current on up to three electrical phases.

❄️ HVAC & Chiller Systems – Monitor current consumption patterns of chillers, compressors and HVAC equipment.

💧 Pumping Stations – Detect pump operation, abnormal loads and unexpected shutdowns.

🔌 Electrical Distribution Panels – Wireless current monitoring for main and sub-distribution circuits.

🔋 UPS & Critical Power Infrastructure – Monitor current in suitable electrical backup systems.

🏗️ Manufacturing Production Lines – Monitor electrical loads across industrial production equipment.

🔧 Predictive Maintenance – Identify unusual current patterns that may indicate equipment problems.

📊 Load Profiling & Operational Analysis – Analyze current usage patterns over time.

📡 Industrial IoT Monitoring – Collect current measurements from distributed facilities through LoRaWAN networks.

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📦 Package Includes

• 1 × Milesight CT305 LoRaWAN Current Monitoring Unit with the selected CT clamp configuration

• 1 × Compatible LoRaWAN antenna

• 1 × USB-C NTC temperature sensor, according to the manufacturer's standard CT3xx packing list

• 1 × Quick Guide

• 1 × Warranty Card

📚 Product Downloads

• Datasheet – Milesight CT3xx Series

• User Guide – Milesight CT305
  

🎥 Product Video