High Accuracy AC Current Sensor – UCT-1250 by Magnelab

70-400 Aac input : 333 mVac output. 1.25″ opening

Product Description

Magnelab’s UCT-1250 is a high accuracy AC current sensor with a 1.25″ opening.

The UCT-1250 complies with ANSI C57.13 0.6 Class and has a phase angle measurement better than 1˚. The output is controlled by a precision resistor fixed at the industry standard of 0.333 Vac. The rugged epoxy encapsulated construction comes with 8′ twisted leads.

This high accuracy AC current sensor is frequently used in:

  • New installation
  • Cost allocation
  • Precision power monitoring
  • Laboratories

When using high accuracy AC current sensors like the UCT-1250, be sure when buying a meter to find an ANSI C12.20 Class 0.5S or better meter. The system is only as good as the weakest component!

Compatible power meters accept a voltage input.  Look for meters on our website that start with this symbol:


You can view all of our current sensors here.


  • Rated input up to 400 Amps
  • Output 0.333 Volt AC at rated current
  • Linearity accuracy +/- 0.5%
  • Accuracy at 10% to 130% of rated current
  • Phase angle < 1˚ measured at 50% rated current
  • Operates from 30 Hz to 1,000 Hz
  • 8 ft. twisted-pair lead
  • Maximum Voltage: 600V (on bare conductor)
  • UL recognized, CE, and RoHS compliant
  • 7-Year Warranty

Data Sheet

 Technical Specs


UL Registered


Made in USA

ISO 9001

rohs compliant

Additional information

Weight0.332 lbs
Dimensions4.5 x 4.5 x 1.0 in