Tel.: +36-20-992-0078, or E-mail: rapaskft@rapasuuhu


Curent transformer / transducer with RS485 interface, Qeed QI-50-V-485

50 A AC/DC current transformer / transducer  with RS485 MODBUS interface and 0-10 V analogue output

Qeed QI-50-V-485

is an AC/DC current transformer, galvanically isolated from the measured circuit. As for its functioning and appearance it is very similar to a standard active CT, however, can measure DC and AC TRMS current. Qeed QI-50V-485 transformer / transducer has an RS485 Modbus serial and an analog output of 0-10V. Span and zero as well as the Modbus address can be configured through the serial RS485 port. 

Main features

  • TRMS Measurement
  • Accuracy 0,5%
  • Analogue (0-10 V) and RS485 output
  • RS485 Modbus integrated
  • DIN rail mounting for both direction
  • OEM’S design, low cost
  • Fully configurable by free interface software FACILE QI-50-V-485

The parameters of the QI-50-V-485 current tranformer / transducer , span, zero as well as the Modbus address can be configured directly from the supervision sytem through the RS485 line or using the freely downloadable software FACILE QI-50-V-485

USB/232-485 adapter (opcional accessory) can be used to connect the PC /laptop having USB port (FACILE software installed on it), to the RS485 bus for congurating the Qeed QI-V-485 parameters


  • Measurement mode:TRMS
  • Measuring range: 50 Arms or 25 Arms by dip-switch set, bipolar (±50A DC or ±25A DC) custom's setting through RS485 port
  • Overload: 2000A pulse, 300A continuous
  • Accuracy: 0,5% F.S.
  • Hysteresis: 0,15% F.S.
  • Crest factor: 2
  • Response time: 1000 ms
  • Output: 0...10 V DC and RS485
  • Band width at -3db: DC or 20...2000 Hz
  • Temperature coefficient: ≤200 ppm/°C
  • Power supply: 12...30 VDC, protection against polarity reversal and overtemperature.
  • Consumption: max 20 mA
  • intrusion protection: IP20
  • Working temperature: -15… +65°C
  • Storage temperature: -40.. +85°C
  • Humidity: 10… 90% not condensing
  • Insulation: 3 kV for bare cable
  • Height of use: Up to 2000 m a.s.l.
  • Dimensions: 46,1x 63x 26,4 mm (without terminals)
  • Weight: 72 g.
  • Removable terminals: 5,08 mm
  • DIP-switch: 8 poles
  • LED: N°1 yellow for signalling power on and data communication
  • Standards: CE EN61000-6-4/2007-01; EN64000-6-2/2006-10; EN61010-1/2001g