Half-price shipping to the EU, UK & Switzerland until 6 Dec · Free on most EU orders over €500 (excl. VAT)

Free help & technical advice Contact us
1 6
Milesight  |  SKU: CT303-868M
Sold out

Milesight CT303 | Self-Powered LoRaWAN Smart Current Transformer (300A)

Price excl. VAT
€121,01
Price incl. 19% VAT
€144,00
Shipping calculated at checkout. Shipping policy

Out of stock right now. We can order it in for you, or pick an in-stock alternative.

See all LoRaWAN Pulse Counters & Meters · Ask about lead time

The Milesight CT303 is a self-powered LoRaWAN current sensor for maintenance-free, non-invasive energy monitoring.

  • Self-powered: from Phase A induced current, USB-C backup
  • Precise monitoring: up to 300 A RMS at ±1% accuracy, 3.3 kHz sampling
  • Full three-phase view: all three phases plus cable-temperature support

VAT & Business Purchases

Prices are shown excluding VAT. For EU deliveries, VAT at the rate of your delivery country is added at checkout. EU businesses with a valid VAT number pay no VAT: enter your company name and VAT number at checkout and the order is invoiced under the intra-community reverse-charge rules. Orders delivered within Cyprus always include Cyprus VAT.

Secure Payment & Warranty
  • Encrypted Checkout: Shop with confidence via Shopify Payments or PayPal Express for fully secure, PCI-compliant transactions.
  • B2B Flexible Billing: For large-scale infrastructure orders, we offer Direct Bank Transfer (SEPA/SWIFT) options. Please contact our team for a pro-forma invoice.
  • Warranty & Support: Consumer purchases are covered by the 2-year legal guarantee of conformity, and manufacturer warranty terms apply per brand. Our engineering team at shopioT provides technical support.

Delivery and Shipping

Tracked delivery within Cyprus by ACS Courier, and to all EU member states, the United Kingdom and Switzerland by FedEx International Priority. Orders ship from our warehouse in Nicosia, Cyprus, typically within 1–3 business days. Shipping cost is calculated at checkout by destination and parcel weight. See our Shipping Policy for rates and delivery times.

EU business? Enter your company name and a valid EU VAT number at checkout to remove VAT (reverse charge).

Description

The Milesight CT303 is a specialized LoRaWAN® Smart Current Transformer designed for industrial and commercial energy management. Engineered for the 300A range, this model eliminates the most common barrier to IoT energy deployments: power supply. By utilizing induced current power technology, the CT303 operates entirely without batteries or external wiring when connected to an active Phase A conductor. Its non-invasive split-core design allows for rapid installation without de-energizing facilities, making it the ideal tool for retrofitting energy intelligence into existing electrical infrastructure.

Core Capabilities

Energy-Autonomous Self-powers via induced current from the testing conductor, ensuring zero maintenance over the device lifecycle.
High-Fidelity Sampling Features a 3.3 kHz sampling frequency for precise RMS current and accumulated usage reporting.
Cable Temp Sensing Supports an external NTC sensor to monitor cable temperature (-20°C to 100°C) for failure prevention.
Non-Invasive Clamp Split-core clamp design eliminates the need for rewiring, drastically reducing installation labor and downtime.

Energy Management Use Cases

• Smart Building Sub-metering: Allocate energy costs to specific tenants or departments with high-accuracy phase monitoring.
• Predictive Maintenance: Detect early signs of machine failure by analyzing current fluctuations and cable temperature rises.
• Load Optimization: Identify peak usage periods and inefficiencies in industrial motors and HVAC systems.

Technical Integration

The CT303 is fully compliant with LoRaWAN® Class A and supports global frequency bands (EU868, US915, etc.). It features Over-the-Air Firmware Updates (FUOTA) and threshold alarm capabilities for instant notification of electrical anomalies. When powered by the testing conductor, it requires a minimum primary current (starting from 15A $A_{rms}$ depending on reporting interval) to report data; for lower current measurement, the unit can be powered via its USB Type-C port. For large-scale facility retrofits, contact the ShopIoT engineering team for system architecture support.

Specifications
  • Primary Communication Protocol
    LoRaWAN
  • Frequency/Region
    EU868
  • Antenna Type
    External (SMA)
  • LoRaWAN Class
    Class A
  • Radio & Range

    TX power: 16 dBm (EU868)

    Sensitivity: -137 dBm

  • Configuration Method
    NFC, USB
  • Activation Method
    OTAA, ABP
  • Monitoring Parameters
    Current (A), Accumulated Current, Cable Temperature
  • Measurement Technology

    Current: split-core clamp current transformer (rated secondary 150 mArms, 3.3 kHz sampling)

    Temperature: NTC

  • Measurement Range

    Current: rated primary current 300 Arms (per CT)

    Minimum reporting current (self-powered): 3 Arms (1-min interval) / 2.5 Arms (10-min interval)

    Temperature (NTC): -20°C to +100°C

    Working frequency: 50–60 Hz

    Wire aperture: Ø24.2 mm

  • Measurement Accuracy

    Current: ±1%

    Temperature: ±1%

  • Measurement Resolution

    Current: 1 mA

  • Power Source
    USB, Self-powered (from measured line)
  • Power Input
    Self-powered by induced current from the measured conductor (phase A wire only); needs at least the minimum reporting current. 5 V via USB Type-C for lower currents. No battery.
  • Dimensions
    Transceiver 38 × 34.5 × 16 mm; CT clamp 56.5 × 36.5 × 68.5 mm
  • Weight
    Transceiver 13.05 g; CT clamp 250 g
  • Enclosure Material
    PC (Polycarbonate)
  • Mounting Options
    Clamp-on (CT)
  • IP Rating
    IP30
  • Environment Rating
    Indoor
  • Operating Temperature
    -20°C to +70°C
  • Certifications
    CE, FCC
  • Warranty
    2 Years

Document Library

CT303 Datasheet

CT303 User Manual

Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • Bancontact
  • Google Pay
  • Klarna
  • Maestro
  • Mastercard
  • MB WAY
  • MobilePay
  • PayPal
  • Satispay
  • Shop Pay
  • Union Pay
  • Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Advangrid GridMate Smart Electricity Monitoring System | shopioT

Unlock Granular Energy Insights with AdvanGrid Gridmate!

To truly optimize your facility, you need to see exactly where every watt is going. Introducing the AdvanGrid Gridmate—a compact, high-density LoRaWAN® electricity monitoring sensor designed for professional sub-metering.

Shop Advangrid GridMate