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Smart Current Transformer - CT305

The CT30x is a LoRaWAN® Smart Current Transformer for monitoring energy consumption and analyzing usage remotely. CT305 provides multiple current options to suit energy monitoring and supports sending threshold alarms. With a 500A current capacity, the CT305 features self-powered operation, eliminating the need for batteries or external wiring, and uses a non-invasive clamp-on design for easy and safe installation.

Key Features

  • Self-Powered Operation: Energy harvesting from measured cables, maintenance-free with no batteries or external wires required
  • High Accuracy Monitoring: RMS current and accumulated current reporting with sampling frequency up to 3.3 kHz
  • 500A Current Capacity: Rated primary current of 500 Arms per CT with 150 mArms rated secondary current
  • Real-Time Monitoring: Sampling rate up to 1s for fast response and alarm capabilities
  • Non-Invasive Design: Clamp-on installation without power de-energizing
  • Temperature Monitoring: Support for external NTC sensor for cable temperature measurement (-20°C to 100°C)
  • Three-Phase Detection: Simultaneous monitoring of three phases
  • Threshold Alarms: Configurable threshold and overrange alarm notifications
  • LED Indicator: Visual indication of working status and alarms
  • FUOTA Support: Firmware Update Over the Air capability

Technical Specifications

  • Protocol: LoRaWAN® (Class A)
  • Frequency: CN470/IN865/RU864/EU868/US915/AU915/KR920/AS923-1&2&3&4
  • Tx Power: 16 dBm (868 MHz) / 20 dBm (915 MHz) / 19 dBm (470 MHz)
  • Sensitivity: -137 dBm
  • Activation: OTAA/ABP
  • Measurement Accuracy: ±1%
  • Resolution: 1 mA
  • Working Frequency: 50~60 Hz
  • Antenna: 50Ω SMA Connector
  • Configuration: USB Type-C or Downlink

Thinger.io Integration

The CT305 seamlessly integrates with Thinger.io through LoRaWAN network servers, enabling remote energy monitoring, real-time current tracking, and alarm management through cloud-based dashboards.

Requirements

A LoRaWAN server is required to communicate the CT305 into Thinger.io, some options are:

Alongside, the corresponding plugin for the selected LoRaWAN server needs to be installed in your Thinger.io instance.

Get Started

Installation

Look for the plugin in the Thinger.io Plugin Store and install it in your Thinger.io instance. Once the plugin is installed a new Product will be created for this device.

Configuration

The Product is already preconfigured, check that the auto provision prefix matches the one selected in your LoRaWAN server plugin in Thinger.io, or change it to your desire.

Usage

Start sending uplinks for autoprovisioning devices and buckets. This product also provides a predefined dashboard and downlinks.

Additional Resources

Milesight CT305 resources can be found at: