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Smart Current Transformer CT303/CT305/CT310

SKU: CT303-915M
Dhs. 1,445.07 AED
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CT3xx Smart Current Transformer – High-Capacity lorawan® Energy Monitoring for 3-Phase Systems The Milesight CT3xx is a lorawan®-enabled smart current transformer designed for high-capacity, real-time current monitoring across three-phase circuits....

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Model: CT303-915M
Smart Current Transformer CT303/CT305/CT310
Dhs. 1,445.07 AED
CT303-915M

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CT3xx Smart Current Transformer – High-Capacity lorawan® Energy Monitoring for 3-Phase Systems

The Milesight CT3xx is a lorawan®-enabled smart current transformer designed for high-capacity, real-time current monitoring across three-phase circuits. With models supporting 300A, 500A, and 1000A RMS current, the CT3xx series provides accurate RMS and accumulated current measurements at up to 3.3 kHz sampling frequency. Featuring a self-powered clamp-on design, integrated USB Type-C interface, and threshold alarm capabilities, CT3xx is ideal for machine fault detection, industrial submetering, and smart energy diagnostics—without interrupting power supply during installation.

Key Features

  • Supports 3-phase current monitoring with multiple clamp options (CT303/CT305/CT310)
  • Accurate RMS and accumulated current measurement (±1%) with 1 mA resolution
  • Sampling frequency of 3.3 kHz enables fast event detection and alarms
  • Self-powered via induced current from the conductor; optional USB-C for extended functionality
  • Clamp-on installation for safe, non-intrusive setup—no de-energizing required
  • Supports cable temperature sensing with NTC probe via USB-C
  • Threshold and overrange alarms; supports FUOTA (firmware update over-the-air)
  • LED status indicator and built-in reboot button
  • Compatible with Milesight gateways and development platform

Model Variants & Measurement Capabilities

Model Primary Current Min Reporting Current (1 min) Min Reporting Current (10 min) Weight (Per Clamp)
CT303 300 A 25 A 15 A 250 g
CT305 500 A 30 A 19 A 276.75 g
CT310 1000 A 60 A 35 A 855.55 g

*Lower current reporting requires external USB-C power.

Technical Specifications

Category Specification
Sampling Frequency 3.3 kHz
Resolution 1 mA
Working Frequency 50–60 Hz
Temperature Sensor NTC (-20°C to 100°C, ±1%)
Wireless Protocol lorawan® Class A (OTAA/ABP)
Frequency Bands CN470 / IN865 / EU868 / RU864 / US915 / AU915 / KR920 / AS923
Tx Power 16 dBm (EU868), 20 dBm (US915), 19 dBm (CN470)
Sensitivity -137 dBm
Power Supply Induced Current or 5V USB-C
Insulation Voltage 3 kVac (1 mA, 1 min)
LED Indicator Status & Alarm Feedback
Configuration USB Type-C or Downlink
Advanced Features Threshold/Overrange Alarm, FUOTA, External Temp Sensor
CT Clamp Cable Length 1 meter
Material Blue, PBT+PC (UL94 V0)
Dimensions (CT Clamp) CT303: 56.5 × 36.5 × 68.5 mm
CT305: 68 × 86 × 41.8 mm
CT310: 97.1 × 119 × 59.5 mm
Wire Hole Diameter CT303: 24.2 mm
CT305: 36.5 mm
CT310: 51 mm
Transceiver Dimensions 38 × 34.5 × 16 mm
Ingress Protection IP30
Operating Temp Transceiver: -20°C to +70°C, Clamp: -40°C to +55°C
Certifications CE, FCC, UL508

Mounting Options

  • CT Clamp: Suspended on Testing Conductor
  • Transceiver: Cable Tie Mount (Integrated Mode)

Ideal Applications

  • 3-Phase Power Panels & Submetering
  • Machine Diagnostics & Predictive Maintenance
  • Smart Building Energy Intelligence
  • Heavy-Duty Industrial Load Monitoring
  • Power Anomaly Detection in Factories

High Current. Zero Downtime. Intelligent Insights.

The CT3xx offers precise energy diagnostics across high-current installations without interrupting operations—delivering data for smarter infrastructure through TerraQ Technologies across the MEA region.
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