Smart Current Transformer CT3xx
CT3xx is a LoRaWAN® Smart Current Transformer for monitoring energy consumption and analyzing usage remotely. CT3xx provides multiple current options to suit energy monitoring and supports sending threshold alarms. Its compact size enables quick and safe installation in any indoor space without de-energizing facilities, there by simplifying the installation and saving costs. Compliant with LoRaWAN® gateway and Development Platform solution, CT3xx can be conveniently monitored via webpage remotely. CT3xx is widely used for energy monitoring in smart buildings, machine failure detection and prevention, etc.
Key Highlights
- Reports RMS current and accumulated current data at minute-level intervals.
- Supports optional reporting for accumulated energy consumption.
- High measuring accuracy driven by a sampling frequency of up to 3.3 kHz.
- Self-powered operation completely free from batteries or external wires.
- Utilizes a 1-second sampling rate for real-time monitoring and quick alarm response.
Product Overview
The CT3xx is a LoRaWAN®-enabled Smart Current Transformer designed for real-time energy monitoring, remote current measurement, and predictive maintenance in commercial and industrial environments. Featuring a non-invasive clamp-on design, it enables quick installation without interrupting power supply, making deployment safe, simple, and cost-effective.
With support for 300A, 500A, and 1000A current ranges, the CT3xx delivers high-precision RMS current measurement using a 3.3 kHz sampling frequency and calculates accumulated ampere-hours every second for detailed energy consumption analysis. Its self-powered operation eliminates the need for batteries or external power sources, ensuring long-term, maintenance-free performance.
Key capabilities include real-time current monitoring, threshold and over-current alarms, optional cable temperature monitoring, one-to-three phase measurement support, and long-range wireless LoRaWAN® communication for seamless integration with IoT energy management platforms. The CT3xx is ideal for smart buildings, factories, commercial facilities, electrical distribution panels, and machine health monitoring applications.
Key Features & Capabilities
Enterprise-grade technology designed for mission-critical operations
Multi-target measurement
One-to-three design allows simultaneous tracking of up to three independent electrical loads
Self-powered operation
Derives power directly from the induced circuit current, eliminating batteries or external wiring
High-accuracy tracking
Features an impressive 3.3 kHz sampling frequency for highly precise RMS and cumulative current data
Non-invasive installation
Split-core current clamp probe design enables quick setup without de-energizing facilities
Real-time anomaly alerts
Utilizes a 1-second sampling rate to send instant threshold, over-current, and temperature alarms
Technical Specifications
Key technical details and performance specifications
| Specification | Details |
|---|---|
| Dimensions | Transceiver: 38 × 34.5 × 16 mm (1.5 × 1.36 × 0.63 in); CT303 Clamp: 56.5 × 36.5 × 68.5 mm (2.24 × 1.44 × 2.70 in), Wire Hole: Ф 24.2 mm |
| Weight | Transceiver: 13.05 g; CT303 Clamp: 250 g |
| Housing Material | PBT + PC (UL94 V0), Blue |
| Detection Parameter | RMS Current |
| Sampling Frequency | 3.3 kHz |
| Working Frequency | 50~60 Hz |
| Rated Primary Current | 300A (CT303), 500A (CT305), 1000A (CT310) |
| Rated Secondary Current | 150 mArms |
| Measurement Accuracy | ± 1% |
| Resolution | 1 mA |
| Temperature Sensor | 1 x NTC Sensor, -20°C ~ 100°C, ± 1% Accuracy |
| Frequency Bands | CN470, IN865, RU864, EU868, US915, AU915, KR920, AS923-1/2/3/4 |
| Transmit Power | 16 dBm (868 MHz), 20 dBm (915 MHz), 19 dBm (470 MHz) |
| Receiver Sensitivity | -137 dBm |
| LoRaWAN Mode | OTAA / ABP Class A |
| Status Indicators | 1 x Status/Alarm LED Indicator |
| Interface Port | 1 x USB Type-C (Power, Configuration, Console, Temperature Sensor) |
| Power Supply | Self-Powered via Induced Current or 5V USB Type-C |
| Insulation Voltage | 3 kVac (r.m.s) (1 mA/1 min) |
| Cable Length | 1 m |
| Operating Temperature | Transceiver: -20°C~70°C (-4°F~158°F); CT Clamp: -40°C~55°C (-40°F~131°F) |
| Storage Temperature | Transceiver: -25°C~80°C (-13°F~176°F); CT Clamp: -40°C~55°C (-40°F~131°F) |
| Humidity | ≤ 95% RH (Non-condensing) |
| Ingress Protection | IP30 |
| Configuration | USB Type-C or LoRaWAN Downlink |
| Advanced Features | Threshold Alarm, Overrange Alarm, FUOTA |
| Installation | Cable-Tie Mounted Transceiver; Clamp Suspended on Conductor |
| Certifications | CE, FCC, UL508 |
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