The Milesight CT3xx series (CT303, CT305, CT310) are LoRaWAN® smart current transformers designed for intelligent energy monitoring and analysis. Built with high accuracy and easy installation in mind, they enable remote tracking of energy consumption, detection of abnormal loads, and predictive maintenance across smart buildings, industrial facilities, and utilities.
Each model in the CT3xx family offers a different current range to suit diverse applications — CT303 for up to 300A, CT305 for up to 500A, and CT310 for up to 1000A. With a compact, non-invasive clamp design, installation is quick and safe without the need to power down equipment. Data is transmitted over LoRaWAN® networks, enabling integration with Milesight IoT Cloud and other platforms for powerful remote monitoring.
Self-powered from the current it measures, the CT3xx series eliminates the need for external wiring or batteries. Combined with real-time sampling, alarm notifications, and firmware upgrade support, these devices provide a long-term, reliable, and cost-effective solution for energy management.
Features
- Accurate RMS current measurement with minute-by-minute accumulation
- High sampling frequency up to 3.3 kHz for precise monitoring
- Self-powered design with optional USB Type-C power input
- Real-time 1-second sampling for rapid alarm response
- Clamp-on, non-invasive installation — no need to de-energize systems
- LED indicator for working status and alarm notifications
- Support for external wire temperature sensor
- Firmware Update Over-the-Air (FUOTA) capability
