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CT103 Smart Current Transformer

SKU: CT103-915M


Go Wireless, Stay Non-Invasive

Key Features:

  • Self-Powered Operation
  • Superior Accuracy with Up to 3.3kHz Frequency
  • Real-time Accumulated Ampere Hour Calculation
  • Non-invasive Installation
  • Irregular Current Status Alert
  • Compact Size for Versatile Placement
  • Cable-Free Design
  • LoRaWAN® Wireless Technology

Description

Product Overview

The Milesight CT103 is a LoRaWAN current transformer sensor engineered to measure AC current in electrical systems and transmit the data wirelessly over long range networks. It is ideal for energy monitoring, load tracking, preventive maintenance and system protection. Its compact design and easy installation make it well suited for use in panel boards, switch cabinets, industrial facilities and smart building installations where continuous insight into current usage helps improve performance and reduce risk.

Key Features

Accurate Current Monitoring

  • Measures AC for reliable tracking of electrical loads

  • Provides real-time current data to detect overload or abnormal conditions

  • Supports energy oversight and equipment protection

LoRaWAN Connectivity

  • Uses LoRaWAN wireless protocol for long-range communication to gateways

  • Low-power design supports extended battery life for long-term deployments

  • Compatible with LoRaWAN network servers and remote monitoring platforms

Durable Industrial Design

  • Compact housing for installation in electrical cabinets or control panels

  • Built for industrial and commercial use with low maintenance requirements

  • Lightweight and easy to integrate into distributed monitoring systems

Flexible Deployment

  • Ideal for energy and load monitoring across factories, buildings and infrastructure

  • Supports integration with building management and automation systems

  • Enables preventive maintenance and performance optimisation

Dimensions Drawings

 

 

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More Information

Brand Milesight IoT
Specifications

Electrical Measurement

RMS current detection

Sampling Frequency

3.3 kHz

Working Frequency

50 to 60 Hz

Rated Primary Current

250 Arms

Rated Secondary Current

125 mArms

Minimum Reporting Current*

12 Arms (1 min interval)

6 Arms (10 min interval)

Measurement Accuracy

±1% (>5 Arms)

±3% (≤5 Arms)

Resolution

1 mA

Temperature Sensor

NTC

Temperature Measuring Range

-20°C to 100°C

Temperature Accuracy

±1%

Wireless Protocol

LoRaWAN®

Antenna Connector

1 × 50 Ω SMA connector (centre pin: SMA female)

Frequency Bands

CN470, IN865, RU864, EU868, US915, AU915, KR920, AS923-1/2/3/4

Transmit Power

16 dBm (868 MHz)

22 dBm (915 MHz)

19 dBm (470 MHz)

Receiver Sensitivity

-137 dBm

LoRaWAN Mode

OTAA / ABP, Class A

Buttons

1 × reboot button

LED Indicator

1 × status or alarm indicator

Interface Port

1 × USB Type-C for power supply, configuration, console or cable temperature sensor

Configuration Methods

USB Type-C or downlink

Software Features

Threshold alarm

Overrange alarm

FUOTA

Power Supply Options

Induced current power supply

5V via USB Type-C

Insulation Voltage

2.5 kVac (r.m.s), 1 mA for 1 minute

Material & Colour

Blue, PBT + PC (UL94 V0)

Extension Cable Length

1 m

Operating Temperature

-20°C to 70°C (-4°F to 158°F)

Storage Temperature

-25°C to 80°C (-13°F to 176°F)

Operating Humidity

≤95% RH (non-condensing)

Ingress Protection

IP30

Dimensions

86.5 × 31 × 37.4 mm (3.4 × 1.22 × 1.47 in)

Wire Hole Diameter

16 mm (0.63 in)

Weight

85.65 g

Installation

Transceiver: cable-tie mounting (integrated mode)

CT clamp: suspended on testing conductor

Regulatory Approvals

CE, FCC, UL508

* The minimum current required for reporting depends on the reporting interval when powered by the testing conductor. For lower current measurements, the device must be powered via USB.

Ordering Information

CT103-915M
LoRaWAN® Smart Current Transformer 250A

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