0.5% Accuracy Rogowski Coil by LEM

Product Description

The 0.5% Accuracy Rogowski Coil by LEM is a flexible clip-around Rogowski coil for the electronic measurement of AC current with galvanic separation between the primary circuit (power) and the secondary circuit (measurement).

The patented Perfect Loop Technology dramatically reduces both the error due to the position of the measured conductor within the aperture, and the error due to the proximity of external conductors.

The LEM Rogowski coil is available in 4 sizes: ⌀70mm, ⌀125mm, ⌀175mm & ⌀300mm.  It is lightweight and easy to install due to its thin coil design.  The coil is 6.1mm thick and outputs 27 mV / 1000A at 60 Hz (22.5 mV / 1000A at 50 Hz).

Compatible power meters accept a voltage input and accept a flexible CT without the need for an integrator.  Look for Measurlogic and eGauge meters on our website that start with this symbol:


To see all Rogowski coil options visit our Rogowski Coil Product Page. You can view all of our current sensors here.


  • Rated insulation voltage 1000 V Cat III PD2
  • Accuracy Class 0.5 (IEC 61869-2)
  • Protection degree IP67
  • ⌀ 70, ⌀ 125, ⌀ 175, ⌀ 300 mm sensing aperture
  • 1.5 m output cable (other lengths available see page 8)
  • Ambient temperature −40 °C … +80 °C
  • Very flexible and thin coil: 6.1 mm
  • Slot for attaching the loop on the primary with a cable tie
  • ⌀ 2 mm hole to pass a security seal tampering
  • An innovative patented clasp drastically reduces the positioning error near the closing
  • Internal shield for enhanced measurement accuracy at low primary currents.


  • Thin, flexible, and light weight
  • Very low positional error
  • Quick, non-intrusive and easy setup
  • A single sensor for a large current range without overload
  • Less influence from external fields
  • Large range of cable diameters


  • MV/LV substations on LV side: Transformer Condition Monitoring
  • Power metering: current measurement for active power calculation
  • Building sub-metering: energy ef ciency monitoring, consumption analysis and cost allocation
  • Power quality monitoring: electrical loads and distribution system equipment
  • Fault Detection, Isolation and Repair (FDIR): isolate the site of the fault
  • Remote Terminal Units (RTU)
  • Phasor Measurement Units (PMU)



ISO 9001

rohs compliant

Additional information

Weight0.5 lbs
Dimensions6 x 6 x 1.5 in

⌀70mm, ⌀125mm, ⌀175mm, ⌀300mm