Milesight CT303 LoRaWAN 3-Phase Smart Current Transformer (up to 500A)
The Milesight CT303 is a three-phase clamp-on smart current transformer that measures RMS current up to 500A across all three phases and reports over LoRaWAN — self-powered from the measured current, so no batteries or wiring. It's a fast, non-invasive way to monitor three-phase machine load, energy use and equipment health. Higher ranges available (CT305/CT310).
3-phase Simultaneous 500A RMS current Self-powered No batteries Clamp-on Non-invasive Energy Load monitoring LoRaWAN Low-powerKey features
- Three-phase RMS current measurement up to 500A — non-invasive clamp-on.
- Self-powered from the measured current — no batteries.
- Simultaneous detection of all three phases.
- Low-voltage / overload alarms.
- Optional cumulative energy reporting.
- LoRaWAN reporting (higher ranges: CT305 to 1000A, CT310 to 1000A).
Specifications
| Model | Milesight CT303 (CT305 / CT310 higher ranges) |
| Communication | LoRaWAN |
| Measurement | 3-phase RMS current, up to 500A |
| Power | Self-powered (induced current) |
| Accuracy | ± 1% |
| Resolution | 1 mA |