Hardware Introduction
Packing List
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| 1 × CT3xx Current Transformer | 1 × USB-C NTC Sensor (1m) | 1 x LoRaWAN® Stubby Antenna |
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| 1 x LoRaWAN® Magnetic Antenna (Optional) | 1 × Quick Guide | 1 × Warranty Card |
Note: If any of the above items are missing or damaged,
please contact your sales representative.
Hardware Overview

Button and LED Indicator
| Function | Action | LED Indicator |
|---|---|---|
| Normal Work | The device is functioning properly. | Green light blinking every 2s |
| Low Power Mode | The device measures and reports at reduced rate. | Green light blinking every 5s |
| Low Voltage Mode | The device only measures at reduced rate. | Green light blinking every 10s |
| Alarm | The current is over the threshold or measuring range, or the temperature is over the threshold. | Red light fast blinking |
| Reboot | Quick press the RST button once. | Green light blinking Once |
Dimensions (mm)

CT303:


CT305:


CT310:







