AC Voltage Potential Transformer – SPT-0375 by Magnelab

115-460 Vac input : 333 mVac ouput

Product Description

Magnelab’s SPT-0375 is an AC voltage potential transformer that converts either a 460, 230 or 115 Vac line to a 333 mVac signal.

This AC Voltage Potential Transformer comes with 8′ input leads and 8′ output leads.

The SPT-0375 is often used to monitor voltage with a safe, millivoltage output. It is 1% accurate and has a phase shift less than 1 degree.

The Magnelab SPT-0375 series of potential transformer provides a linear output voltage proportional to the input voltage. The output voltage uses the ANSI standard of 0.333 volts.  This makes the SPT series ideal for data loggers and other electronic measuring instrumentation. Custom outputs and other parameters are available at customer request.


  • Rated input from 115 volts to 460 Volts
  • Output of 0.333 Volt at rated voltage
  • Linearity accuracy +/- 1%
  • Accuracy at 10% to 130% of rated voltage
  • Phase angle < 1 degree
  • Withstand voltage of 2,500 Vrms primary to secondary
  • Input leads 14 AWG 8 ft., Output leads 22 AWG 8 ft.
  • Two mounting holes using #8/32 blind inserts
  • 7-Year Warranty

Data Sheet

Technical Specs


UL Registered


Made in USA

ISO 9001

rohs compliant

Additional information

Weight1.2 lbs
Dimensions6 x 5.5 x 1.5 in
Input Voltage

115Vac, 230 Vac, 460 Vac