i-Snail-A: 4-20mA Loop Powered Current Transducer


  • Highly accurate, true RMS measurement. Compatible with SCRs and VFDs
  • Self powered from the 4 - 20 mA loop.
  • Robust construction, compact size and easy wiring.
  • Ideal for Control and Energy Management applications.


The i-Snail-A transducer offers inexpensive yet accurate true RMS monitoring of AC current in one circuit.

This product is ideal as a precision AC load transducer for Control and Energy Management applications.

Combined with a standard 5A CT the loop powered i-Snail-A provides a convenient tool for accurate load monitoring in any electrical equipment.

Product Description

The i-Snail-A is a precision current transducer that performs true RMS current measurements in one AC circuit wired through an interfacing CT mounted on the top of the enclosure.

The i-Snail-A may be ordered for various current ranges. The 0-5A and 0-10A current ranges feature a precision CT providing 0.3% accuracy (full scale). Other standard ranges include 25A, 50A and 100A. The i-Snail-A may be calibrated for other input ranges upon request. The 5A calibrated i-Snail-A can be applied to the secondary wire of a 5A CT thus extending the metering range as required.

The i-Snail-A is powered from the 4 -20 mA current loop (it acts as a two wire loop device). It will accept a wide range of loop excitation voltages, typically 24 VDC. The ETA1.420 unit is hermetically potted in a small plastic enclosure equipped with two mounting holes. A barrier strip terminal is provided for the output wiring.

The i-Snail-X does not include a built in CT and is equipped with spade connectors allowing remote installation of various Elkor miniature CTs (MCTA and MSCT).


PowerStandard 4-20mA loop; voltage 8 - 35 VDC
InputCurrent input through CT up to calibrated Range. Unit may be used as a secondary to 5A CT for higher input ranges.

i-Snail-X: external CT
Output4-20 mA loop (sinking); max. impedance 750 R @ 24VDC (barrier strip terminal provided)
AccuracyTRMS, 0.3% FS for 0-5A & 0-10A range, 0.5% for other ranges.
EnclosurePotted plastic box (L=3", W=1.1", H=0.5" + CT Height), panel mount ready. Interfacing CT permanently attached on the top (except i-Snail-X version); Dielectric test (input/output) - 4 kVRMS

Ordering Information

Input Range Part Number Accuracy
(full scale)
Window Size Maximum Wire Size
0-5A i-Snail-A-5 0.3% 6.9mm (0.272") AWG #10
0-10A i-Snail-A-10
0-25A i-Snail-A-25
0-50A i-Snail-A-50 0.5% 14.5mm (0.570") AWG #2
0-100A i-Snail-A-100
(External CT)

(External CT type and FS Range must be provided)
0.3% + CT Accuracy N/A (Depends on CT)


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