The 2SFT-151 is a current transformer (CT) designed for metering and monitoring applications. It has a ratio of 150:5, operates over a frequency range of 50 Hz to 400 Hz, and is available in both ANSI-rated and non-ANSI-rated versions depending on manufacturer (Sifam Tinsley, Crompton/TE Connectivity, Allen-Bradley).

Detailed Specifications & Description

• Type & Application

  • Current Sense Transformer used for electrical metering, monitoring, and protective relaying.
  • Designed for panel mounting with a solid-core window type construction.

• Electrical Ratings

  • Primary Current: 150 A
  • Secondary Current: 5 A
  • Turns Ratio: 150:5
  • Frequency Range: 50 Hz – 400 Hz
  • Burden/Class:
    • ANSI-rated versions: Class 1 accuracy, 4 VA burden
    • Non-ANSI versions also available depending on supplier

• Construction Features

  • Solid-core design (non-invasive, requires conductor threading through window).
  • Window/Inner Diameter: 28.7 mm (1.13 inches) for conductor pass-through.
  • Panel mount style for easy installation.
  • Compact and lightweight for instrumentation panels.

• Manufacturers & Variants

  • Sifam Tinsley Instrumentation Inc. – ANSI CT version (Omega 30 series)
  • Allen-Bradley (Rockwell Automation) – Model 1411-2SFT-151, solid-core CT
  • Crompton / TE Connectivity – Non-ANSI rated window type CT