Smart Current Transformer – LoRaWAN® energy monitoring: CT10x (CT101 / CT103 / CT105)
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Smart Current Transformer – LoRaWAN® energy monitoring: CT10x (CT101 / CT103 / CT105) | Milesight

The Milesight CT10x series is a LoRaWAN® smart current transformer designed to monitor energy consumption remotely and trigger threshold/overrange alarms. Its non-invasive clamp design enables quick indoor installation without de-energizing the facility, helping reduce downtime and installation costs.

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The Milesight CT10x series is a LoRaWAN® smart current transformer designed to monitor energy consumption remotely and trigger threshold and overrange alarms. Its non-invasive clamp design enables fast indoor installation without power interruption, reducing downtime and installation costs.

Key benefits

  • RMS current and accumulated current measurement with minute-level reporting
  • High accuracy with sampling frequency up to 3.3 kHz
  • Fast response with sampling rate down to 1 second for alarm detection
  • Self-powered from induced current, with optional USB-C power supply
  • Flexible and detachable installation suitable for compact electrical panels
  • Optional cable temperature monitoring via external USB probe
  • Compatible with standard LoRaWAN® gateways and supports FUOTA

Available current clamps (probes)

The CT10x platform is available with three current clamp options, allowing precise adaptation to the monitored load: CT101 (100 A), CT103 (250 A), and CT105 (500 A). CT101 and CT103 are available with a detachable clamp design, while CT105 is optimized for higher current conductors.

Comparison table – current clamp selection

ModelRated Primary CurrentRated Secondary CurrentMinimum Reporting Current*Accuracy / ResolutionWire OpeningMechanical Notes
CT101 100 Arms 100 mArms 6 Arms (1 min) / 4 Arms (10 min) ±1% (> 5 A), ±3% (≤ 5 A) / 1 mA Ø 16 mm Compact clamp, detachable design
CT103 250 Arms 125 mArms 12 Arms (1 min) / 6 Arms (10 min) ±1% (> 5 A), ±3% (≤ 5 A) / 1 mA Ø 16 mm Compact clamp, detachable design
CT105 500 Arms 150 mArms 30 Arms (1 min) / 10 Arms (10 min) ±1% (> 5 A), ±3% (≤ 5 A) / 1 mA Ø 36.5 mm Large opening for high-current conductors

*Note: Minimum reporting current depends on the reporting interval when the device is powered only by the measured conductor. For reliable measurement at low currents, USB-C external power is recommended.

Optional temperature probe

The CT10x supports an external USB temperature probe for cable temperature monitoring. The probe uses an NTC sensor with a measuring range from -20 °C to +100 °C and an accuracy of ±1%.

Wireless communication and configuration

  • LoRaWAN® Class A, OTAA and ABP supported
  • Frequency plans: EU868, US915, AU915, AS923, KR920, IN865, RU864, CN470
  • Transmit power up to 22 dBm (region dependent)
  • Receiver sensitivity down to -137 dBm
  • Local or remote configuration via USB-C or downlink

Mechanical and environmental characteristics

  • Power supply: induced current or 5 V USB-C
  • Insulation voltage: 2.5 kVac RMS (1 mA, 1 minute)
  • Ingress protection: IP30 (indoor use)
  • Operating temperature: -20 °C to +70 °C
  • Relative humidity: up to 95%, non-condensing

Antenna options

  • Mini stubby antenna (50 mm)
  • Stubby antenna (108 mm)
  • External magnetic antenna

Typical applications

  • Energy monitoring and sub-metering in smart buildings
  • Load profiling of electrical equipment
  • Preventive maintenance through abnormal current detection
  • Remote diagnostics and alarm-based monitoring

How to select the right probe

  • CT101 for circuits up to 100 A with compact conductors
  • CT103 for mid-range loads up to 250 A
  • CT105 for high-current feeders up to 500 A
  • Use USB-C power for low-current measurement scenarios
  • Add the temperature probe when thermal monitoring is required

For project support and system sizing, ES Canada provides technical guidance on probe selection and LoRaWAN® deployment.

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