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Home > Current Switches & Transducers > Current Switch - Autoset-VFD/CV

Current Switch - Autoset-VFD/CV

  • Self-calibrating for proof of flow
  • 0.5-135A range
  • N.O. 30VAC/DC or 120VAC output
  • Optional command relay


  • Detecting belt loss, coupling shear, and mechanical failure on variable frequency drives and constant volume fans and pumps


The AutoSet™ VFD self-calibrates to detect proof of flow on both variable frequency driven and constant volume motors on fans or pumps.  The C-2350VFD automatically set the proper threshold, eliminating false alarms associated with varying frequencies.  Detects motor undercurrent conditions such as belt loss, coupling shear, and mechanical failure on fans and pumps while reducing installation time.

Product     Price   Quantity
C-2350VFD Current Switch, AutoSet, VFDSplit-core, 1-135A range   $ 147.00
CR3-12 Command Relay, N.O., 12 VDCcoil   $ 25.50
CR3-24 Command Relay, N.O., 24 VAC/DCcoil   $ 25.50
CR4-12 Command Relay, N.C., 12 VDCcoil   $ 25.50
CR4-24 Command Relay, N.C., 24 VDCcoil   $ 25.50


List prices shown; trade pricing appears on orderpad for Senva Trade Accounts.
For qualified trade pricing, please contact us at 866-660-8864.
Oregon has no sales tax.

Self calibration for proof of floor on fans and pumps

  • Works without costly 'training' of sensor - our sensors are just plain smarter!
  • No need to open hot starter enclosures - save on labor as well as improve safety
  • Only VFD sensor line capable of functioning on VFDs to 0.5A
  • Sensor is always properly adjusted—no call backs
  • Push-button and LED interface:
    • Slow blink = normal operation
    • Fast blink = alarm
    • Fast learn mode (optional): Press/hold button 1 second, LED makes 2 fast blinks.
    • Go/No mode (optional) : Press/hold button 5 seconds, LED makes 3 fast blinks.

Split-core with optional command relay

  • Easy installation and provides stop/start/status in unitary device—saves component and installation space/cost

Maintenance-free—no call backs

  • Superior to differential pressure sensors
  • Industry leading 7 year warranty
Split Core Min (on) Max A Output* Sensor Power

3.5A @ 60Hz

1.5A @ 20Hz

2.5A @ 10 Hz

135A 1.0A@30VAC/DC Induced
Command Relay Contact rating Coil
CR3-24 N.O. 10A@125VAC 24VAC/DC, 15mA nom.
CR4-24 N.C. 10A@125VAC 24VAC/DC, 15mA nom.
CR3-12 N.O. 10A@125VAC 9-12VDC, 30mA nom.
CR4-12 N.C. 10A@125VAC 9-12VDC, 30mA nom.
Standard Output Rating 1.0A@30VAC/DC
Line Voltage Output Rating 0.2A@120VAC (-HV MODEL ONLY)
Output Type NO, solid-state FET
Temperature Rating -15-60 ° C
Insulation Class 600V RMS. For use on insulated conductors only! Use minimum 75 ° C insulated conductor
Frequency Range 50/60Hz