CT-MS Series Current Transformer w/ 1 or 5A Output by NK Technologies

Product Description
1 A and 5 A Secondary Current Transformers offer a compact, cost-effective means of measuring primary current. These current transformers provide an easy-to-install method to measure AC current, producing a 0–5 A output proportional to the current flowing through the sensing window. The CT-MS series offers a larger than average sensing windows and a split-core design for easy installation.
Current Transformer Applications
  • Serves as a current input for use with APT and APN series KW transducers.
  • Saves space in control panels by remotely locating the sensing of the current closer and the load.
  • The current transformer secondary can be connected to the NK CTC-05A-420-24L-DIN to produce a loop powered, 4-20 mA signal proportional to the current through the CT.


  • Split-core case for convenient installation over large wires or bus bars.
  • 5 V secondary is compatible power monitors and panel meters designed for the 5 A input.
  • Larger sensing windows: MS Series aperture measures 2.22” x 1.19” and measures current from 0–150 to 0–800 A.
  • Plated terminals for reliability
  • UL recognized file E475131. Meets ANSI/IEEE C57.13 and IEE C57.13.2

Data Sheet

Reader CT-MS & CT-LS Series

Reader CT-MS & CT-LS Manual

Additional information

Weight1 lbs
Dimensions3.5 x 2.25 x 1.25 in

150A, 200A, 300A, 400A, 500A, 600A, 800A

Output Signal (Secondary)

0-1 A, 0-5 A