100 mA Current Transformer – 4LSF-100 by Sentran Corp

Product Description

The 4LSF-100 by Sentran Corp takes an input up to 1600A and outputs a corresponding 100mA with 0.5% accuracy.

This UL Listed 100mA current transformer comes in various size/amperage combinations and can be customized if needed.  See the Amperage / Size selector below to see stocked options.  These units are typically 0.5% accurate (depends on the burden).

These UL Listed current sensors can be are rated CAT IV. They are UL Listed for field installation with any UL listed or UL recognized meter.  The 4LSF has passed the extreme insulation and temperature tests of UL2808 and CSA/CAN 61010-1.

The 4LSF is also available with an output of 333 mV.  Click here to see this configuration.

Common Applications for the 4LSF:

  • Computer Data Centers
  • Energy Monitoring
  • HVAC Monitoring
  • Industrial Control Systems
  • Lighting Control
  • Motor Monitoring
  • Distribution Transformer Monitoring
  • Power Control Panels
  • Breaker Panels
  • Power Distribution
  • Power Quality
  • Process Control Systems
  • Residential Energy Monitoring
  • Secondary Metering
  • SCADA Systems
  • Solar Power Inverter Monitoring
  • Wind Power System Monitoring
  • Geothermal Power Systems

4LSF-100 compatible power meters accept an amperage input.  Look for meters on our website that start with this symbol:


You can view all of our current sensors here.


  • Input Current: AC current, single phase 50/60Hz (must specify)
  • Crest Factor:  Set to 1.414 time full scale input current
  • Voltage Rating: 600VAC rated CAT IV
  • Bandwidth: 50Hz to 400Hz
  • Voltage option available, see 4LSF-333.
  • Current Output Options: 100, 250, 333, 500, 1000 mA
  • Output Limiting: 14V peak transient voltage suppressor for current ratio type
  • Standard Accuracy: Class 1.0 per Table 11*, IEC 60044-1
  • Optional Accuracy (OPT O.5): Class 0.5 per Table 11*, IEC 60044-1
    • *Note: Sentran Corp, accuracies are better than Table 11 with conductor or busbar located in the center and perpendicular to the window opening.
  • Output Resistance (voltage output type): <100 ohms typical
  • Interface Resistance or Impedance: Must be >100K ohms
  • Temperature Range, Environment: -40°C to 70°C
    • Note: This is very conservative UL rating, can be as high as 1.25X
  • Shorted Output Capability: Continuous as FLA
  • Dynamic Rating: 50 times FLA for 5 seconds once per 5 minutes. Note: This is a Sentran Corporation conducted test.
  • Max Altitude: 2000 meters
  • Pollution Degree: 2
  • Humidity: 95% non-condensing
  • Construction: UL approved per UL2808 CAT IV to 120°C
  • Lead Wires: Black/white twisted pair. 18AWG MTW, UL1015 double insulated
  • Installation Label: Label towards source for white lead positive

Data Sheet

Technical Spec


UL Listed


Made in USA

ISO 9001

rohs compliant

Additional information

Weight.82 lbs
Dimensions1.5 x 5 x 5 in

10A, 20A, 30A, 50A, 100A, 200A, 400A, 800A, 1200A, 1600A


0.75" (19mm), 1" (25.4mm), 1.5" (38.1mm), 3.0" (76.2mm) x 3.5" (89mm), 4" (101mm) x 6" (152mm)


0.5% Class, 1% Class

Lead Time

In-stock, 3 weeks