Milesight CT101 LoRaWAN 100A Smart Current Transformer (EU868)

The Milesight CT101 is an advanced LoRaWAN Smart Current Transformer designed for wireless electrical current monitoring in commercial buildings, electrical distribution panels, industrial facilities and energy management applications.

Featuring a 100A RMS current measurement capacity, the CT101 provides a practical solution for monitoring individual electrical circuits, lighting installations, office equipment, small HVAC systems, pumps and other electrical loads.

Its split-core current transformer design enables installation around an existing electrical conductor without cutting or disconnecting the monitored cable, making it particularly suitable for upgrading existing electrical installations.

Unlike multi-channel current monitoring systems, the CT101 is designed for single-channel current measurement, allowing detailed monitoring of one selected conductor or electrical circuit.

The device measures RMS electrical current, using a 3.3 kHz sampling frequency to provide accurate monitoring of changing electrical loads.

It offers ±1% measurement accuracy for currents above 5A RMS and ±3% accuracy for currents up to 5A RMS, with a measurement resolution of 1 mA.

In addition to reporting electrical current, the CT101 supports accumulated ampere-hour (Ah) measurements, providing useful information for evaluating electrical load patterns and equipment operation.

One of its most important advantages is its battery-free, self-powered operation.

The CT101 harvests electrical energy inductively from the conductor being monitored, eliminating the need for routine battery replacement or permanent external wiring under suitable operating conditions.

For circuits with very low current levels, where the available induced energy is insufficient, the device also supports external 5V power through its USB Type-C port.

The CT101 communicates through LoRaWAN EU868, enabling long-range wireless transmission of measurement data to compatible LoRaWAN gateways and network servers.

It supports LoRaWAN Class A operation, with OTAA and ABP network activation, allowing integration into standard LoRaWAN infrastructures and compatible IoT platforms.

The device also supports configurable current threshold alarms and overrange alarms, allowing monitoring systems to detect abnormal electrical loads, unexpected equipment operation and potentially overloaded circuits.

For additional monitoring capabilities, the CT101 supports an external NTC temperature sensor, enabling cable temperature measurement over a range of −20°C to +100°C.

Its compact enclosure and 16 mm conductor opening make it suitable for installation in electrical distribution boards and other restricted indoor technical spaces.

The CT101 features a detachable transceiver design, providing additional flexibility when positioning the communication module in challenging installation environments.

Configuration can be performed locally through USB Type-C or remotely using supported LoRaWAN downlink commands.

The device also supports Firmware Update Over the Air (FUOTA), helping simplify maintenance across distributed installations.

With an IP30 protection rating, the CT101 is intended for protected indoor environments, including electrical cabinets and technical rooms.

The Milesight CT101 is especially suitable for electrical load monitoring, lighting circuit supervision, HVAC equipment monitoring, equipment operating-status detection and predictive maintenance.

By combining 100A current measurement, battery-free operation, non-invasive installation and LoRaWAN wireless communication, the CT101 provides a flexible solution for professional electrical monitoring and Industrial IoT applications.

Important: The CT101 directly measures RMS current (A) and accumulated current (Ah). Any calculated electrical energy consumption in kWh is an estimate based on configured electrical parameters and is not equivalent to direct, certified energy metering. For accurate or billing-grade kWh measurement, a suitable electrical energy meter should be used.

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🔑 Key Features

⚡ 100A RMS Current Measurement – Measures electrical current up to 100 A on a single conductor.

🔌 Single Current Measurement Channel – Dedicated monitoring of one electrical circuit or phase.

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

🔋 Battery-Free Operation – Powered inductively from the monitored electrical conductor.

🔌 Optional 5V USB-C Power Supply – External power for circuits with insufficient current for self-powered reporting.

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

🎯 High Measurement Accuracy – ±1% above 5A RMS and ±3% at or below 5A RMS.

📊 3.3 kHz Sampling Frequency – Accurate RMS current measurement with high-frequency sampling.

📈 Accumulated Current Monitoring – Reports accumulated ampere-hour (Ah) measurements.

🔔 Current Threshold Alarms – Detect unusual increases or decreases in electrical current.

🚨 Overrange Alarms – Identify current values exceeding the supported measurement range.

🌡️ NTC Temperature Sensor Support – Additional cable temperature monitoring from −20°C to +100°C.

📏 16 mm Conductor Opening – Compact clamp design for electrical panels and restricted spaces.

🔧 Detachable Communication Module – Flexible positioning for suitable installation environments.

⚙️ Remote Configuration – Configure supported parameters through LoRaWAN downlinks.

🔄 FUOTA Support – Firmware updates over the air.

📶 LoRaWAN Class A / OTAA / ABP – Standard LoRaWAN network compatibility.

💡 LED Status Indicator – Visual indication of device operation and alarms.

🛡️ IP30 Protection – Suitable for protected indoor installations.

🏭 Electrical Load Monitoring – Suitable for equipment supervision and preventive maintenance.

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🛠 Applications

🏢 Commercial Building Monitoring – Monitor electrical current in individual circuits and distribution boards.

💡 Lighting Circuit Monitoring – Track lighting loads and identify unexpected operating conditions.

❄️ HVAC & Air Conditioning – Monitor the current drawn by smaller air-conditioning units and ventilation equipment.

🧊 Commercial Refrigeration – Monitor current patterns of compatible refrigerators and cooling equipment.

💧 Water Pumps & Small Motors – Detect operating status, unexpected shutdowns and abnormal current conditions.

🏭 Industrial Equipment Monitoring – Track the electrical load of individual machines.

🔌 Electrical Distribution Panels – Add wireless current monitoring to existing electrical installations.

🏬 Retail Stores & Offices – Monitor selected electrical circuits and equipment operating patterns.

🔧 Predictive Maintenance – Identify unusual current trends that may indicate developing equipment faults.

📊 Electrical Load Analysis – Collect historical current measurements for operational analysis.

📡 Industrial IoT Systems – Integrate current monitoring into remote LoRaWAN applications.

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📦 Package Includes

According to the manufacturer's CT10x hardware documentation:

• 1 × Milesight CT101 Smart Current Transformer with 100A split-core clamp

• 1 × USB-C NTC Temperature Sensor with 1 m cable

• 1 × LoRaWAN Stubby Antenna

• 1 × Transceiver Cover

• 1 × Extension Cable (1 m)

• 1 × Quick Guide

• 1 × Warranty Card

Product Downloads

📥 CT101/103 Datasheet (EN)
📥 User Guide (EN)

Product Video