QI-50-V-485 Current Transformer

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QI-50-V-485 Current Transformer

QI-50-V-485

Current Transformer AC/DC TRMS - RS485 MODBUS 


The QI-50-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 TRMS. 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.

It’s possible to connect via serial RS485 to the QI-50-V-48 through a converter USB/232-485 for setting the parameters of zero and span and configuration of the Modbus addresses directly from your system of supervision, or using the free FACILE QI-50-V-485 software. You can download our software on  www.qeed.it


Via the serial link RS485-USB you can connect to the  QI-50-V-485 via the interface program FACILE QI-50-V-485. Using this software, free download from www.qeed.it,   allows you to configure the processor by setting the START and STOP input and output (see diagram), you can set the Modbus address of the PC to which the query transformer and decide whether to make monopolar (only positive or negative values  ) or bipolar (see diagram). If you are using bipolar function on AC current, the value read will be 0 A (5 V) because you are reading the average value. By means of dip-switch can configure the QI-50-V-485 to set the scale to 25 or 50A, the function monopolar (TRMS) or bipolar (mean value), the Modbus address (see register map below) up to a maximum of 15 addresses.

MOUNTING: The current transformer QI can be mounted in any  position (see photo below), horizontal or vertical  mounting,  horizontal or vertical through the two hooks for DIN rail included in the box.

CAUTION: Magnetic fields of high intensity can vary the values   measured by the transformer. Avoid installation near permanent magnets, electromagnets or iron masses that induce strong changes in the magnetic field. If any irregularity recommend reorient or move the transformer   in the area most appropriate.



Any changes made by dip-switch required to switch off the power supply. It’s a safety condition in order to prevent any manumission on the device.



POWER SUPPLY 12...30Vdc, Protection against polarity reversal and overtemperature. 
ABSORPTION Max 20mA
PROTECTION INDEX IP20
ACCURACY 0,5% F.S
RESOLUTION 12 bit
TEMPERATURE COEFFICIENT <200 ppm/°C
WORKING TEMPERATURE -15...+65°C
STORAGE TEMPERATURE -40°C... +85°C
RESPONSE TIME 1000 ms on analog output, 30ms on serial output
TYPE OF MEASURE TRMS (monopolar)
RANGE 50 Arms o 25 Arms dip-switch setting, bipolar (+/- 50A DC o +/-25A DC), RS485 customize setting
OUTPUT 0...10V  and RS485
BAND WIDTH AT -3dB DC or 20...2000 Hz
ISOLATION 3kV on bare wire
OVERLOAD 2000 A pulse, 300A continuos
CREST FACTOR 2
HYSTERESIS 0,15% f.s.
HUMIDITY 10...90% not condensing
ALTITUDE Up to 2000 m s.l.m
WEIGHT 72 g.
FILLING Epoxy Resins
BOX MATERIAL PBT, grey
MOUNTING Screw predisposition for vertical/ horizontal mounting, DIN rail clips (included) for  vertical/horizontal mounting. 
TERMINAL Removable terminals  3,5mm, 5 poles
DIP-SWITCH 8 poles
LED N°1 yellow, Power on fixed, data communication blinking
STANDARDS CE EN55022: 2010-12;  EN55024: 2010-11;
DIMENSIONS 46,1x 63x 26,4 mm (terminal excluded)

High accuracy, yet very cost effective split-core AC/DC current transformers supplier in Malaysia & Singapore. Available in Penang, KL, Selangor, Johor & anywhere in Malaysia & Singapore.

Ketepatan tinggi, pembekal pengubah arus AC/DC teras pembahagi yang sangat berkesan dari segi kos di Malaysia & Singapura. Available in Penang, KL, Selangor, Johor & anywhere in Malaysia & Singapore.

Available in Penang, KL, Selangor, Johor & anywhere in Malaysia & Singapore.

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