Milesight CT3x Smart Current Transformer

SKU: CT305-868M

Details Additional Info Data Sheet Manual

£147.90*

Product Description

The Milesight CT3xx series (CT303, CT305, CT310) are LoRaWAN® smart current transformers designed for intelligent energy monitoring and analysis. Built with high accuracy and easy installation in mind, they enable remote tracking of energy consumption, detection of abnormal loads, and predictive maintenance across smart buildings, industrial facilities, and utilities.

Each model in the CT3xx family offers a different current range to suit diverse applications — CT303 for up to 300A, CT305 for up to 500A, and CT310 for up to 1000A. With a compact, non-invasive clamp design, installation is quick and safe without the need to power down equipment. Data is transmitted over LoRaWAN® networks, enabling integration with Milesight IoT Cloud and other platforms for powerful remote monitoring.

Self-powered from the current it measures, the CT3xx series eliminates the need for external wiring or batteries. Combined with real-time sampling, alarm notifications, and firmware upgrade support, these devices provide a long-term, reliable, and cost-effective solution for energy management.

Features

Accurate RMS current measurement with minute-by-minute accumulation
High sampling frequency up to 3.3 kHz for precise monitoring
Self-powered design with optional USB Type-C power input
Real-time 1-second sampling for rapid alarm response
Clamp-on, non-invasive installation — no need to de-energize systems
LED indicator for working status and alarm notifications
Support for external wire temperature sensor
Firmware Update Over-the-Air (FUOTA) capability

We can supply third-party online wireless sensor monitoring and notification system to view data and set alerts via SMS text and email. Ask us about our zero-touch provisioning service, these sensors can be supplied pre-configured and ready to go.

Parameters

Detection Parameter	RMS Current
Sampling Frequency	3.3 kHz
Working Frequency	50 – 60 Hz
Rated Primary Current (per CT)	CT303: 300A \| CT305: 500A \| CT310: 1000A
Rated Secondary Current	150 mArms
Accuracy	±1 %
Resolution	1 mA
Temperature Sensor	NTC sensor, -20°C to 100°C, ±1 % accuracy

Power Supply	Induced current power supply or 5V via USB Type-C
Insulation Voltage	3 kVac (1mA/1 min)
Operating Temperature (Transceiver)	-20°C to 70°C
Operating Temperature (CT Clamp)	-40°C to 55°C
Relative Humidity	≤ 95% (non-condensing)
Ingress Protection	IP30
Storage Temperature	Transceiver: -25°C to 80°C \| Clamp: -40°C to 55°C

Protocol	LoRaWAN®
Antenna Connector	1 × 50 Ω SMA (Center PIN: SMA Female)
Supported Bands	CN470 / IN865 / RU864 / EU868 / US915 / AU915 / KR920 / AS923-1/2/3/4
Tx Power	16 dBm (868 MHz) / 20 dBm (915 MHz) / 19 dBm (470 MHz)
Sensitivity	-137 dBm
Mode	OTAA / ABP, Class A

Dimensions (Transceiver)	38 × 34.5 × 16 mm (1.5 × 1.36 × 0.63 in)
Dimensions (CT Clamp)	CT303: 56.5 × 36.5 × 68.5 mm \| CT305: 68 × 86 × 41.8 mm \| CT310: 97.1 × 119 × 59.5 mm
Weight (per CT Clamp)	CT303: 250 g \| CT305: 276.75 g \| CT310: 855.55 g
Cable Length	1 m
Wire Hole	CT303: Ø 24.2 mm \| CT305: Ø 36.5 mm \| CT310: Ø 51 mm
Housing & Color	PBT+PC (UL94 V0), Blue
Installation	Transceiver: Cable-tie mounting \| Clamp: suspended on conductor
Certifications	CE, FCC, UL508

All of our products are available to customers throughout Europe. For more information on shipping costs, currency conversions and lead times, please contact our technical sales team. Our technical sales team are also happy to advise customers on the best LoRaWAN® sensors to suit specific project requirements.

Basket

Subtotal: £

Milesight CT3x Smart Current Transformer

Product Description

Features

Parameters

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Subtotal: £

Milesight CT3x Smart Current Transformer

Product Description

Features

Parameters

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