MILESIGHT - Current clamp 300/25A

Presentation

The Milesight CT303 is a three-phase current transducer designed for non-intrusive current measurement up to 300 A per phase. It integrates three induction current clamps, an NTC temperature sensor, and long-range LoRaWAN transmission on the EU868 band. The CT303 offers accurate RMS current acquisition and enables remote energy supervision without interrupting the electrical circuit.

Applications

• Consumption monitoring on three-phase industrial installations
• Load analysis and phase balancing
• Overcurrent detection and preventive diagnostics
• Integration into wireless energy management solutions
• Thermal monitoring of cables via NTC probe

Main functions

• RMS current measurement up to 300 A per phase
• 1 mA resolution and ±1% accuracy
• Sampling frequency: 3.3 kHz
• Temperature measurement via NTC sensor :
• -20°C to 100°C
• LoRaWAN EU868 radio transmission, sensitivity down to -137 dBm
• Transmit power: 16 dBm
• Configuration via USB-C or downlink port
• Configurable current threshold detection
• Inductive power supply

Technical data

• Measured parameter: three-phase RMS current
• Range: 0 to 300 A per phase
• Resolution: 1 mA
• Accuracy: ±1%
• Radio protocol: LoRaWAN 1.0.3, class A
• Frequency: EU868 MHz Tx
• Power: 16 dBm
• Radio sensitivity: -137 dBm
• Antenna connector: SMA female 50 Ω
• Local interface: 1 × USB-C
• Power supply: induction on tested cable
• Insulation voltage :
• 3 kVac, 1 mA / 1 min
• Housing: PBT+PC (UL94 V0), IP30
• Transceiver dimensions: 38 × 39.7 × 16 mm
• CT clamp dimensions: 97.9 × 119 × 60 mm
• Supported cable diameter: Ø 51 mm
• Temp.
• transceiver operation: -20 °C to 70 °C
• Clamp operation: -40 °C to 55 °C
• Relative humidity: ≤ 95% (non-condensing)
• Installation: transceiver clamped, clamp suspended