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Latest added news blog
LogBox Connect Data Logger
Kenny Laidlaw
Mar 12,2018
The LogBox Connect are a range of small, compact data loggers with wireless connectivity options of more >


Quick Overview

QI-300-V-485 single phase RMS current transformer, input range ±300 Amps, power supply 12-30vDC. Accuracy 0.5%FS. Bandwidth 20-1000Hz. RS485 Modbus output, and 0-10vDC output.


The QI-300-V-485 is a AC/DC current transformer, galvanically isolated from the measuring circuit. The device is in the function and appearance is very similar to a standard active TA, however, able to measure the DC component and AC RMS. The transformer is equipped with RS485 Modbus serial output and an analog output 0-10V. Through the serial port can be configured freely span and zero and assign the Modbus address.


  • Supply: 12-30vDC, Protection against polarity reversal and over- temperature, Max 20mA
  • Protection:  IP20
  • Accuracy: 0,5% F.S.
  • Resolution: 12 bit
  • Temperature Coefficient: < 200 ppm/°C
  • Response Time: 1000 ms
  • Hysteresis: 0,15% F.S.
  • Working Temperature: -15 to +65°C
  • Measurement: RMS or bipolar
  • Range: ±300A rms
  • Crest Factor: 2
  • Frequency: DC or from 20…1000 Hz
  • Isolation: 3 kV on bare wire
  • Over-range: 2.000 A pulse / 300 A continuous
  • Output: 0-10vDC (min. load >2Kohm) and RS485 Modbus RTU

Availability: Stock Item