Current Transformers 

Astrodyne TDI current transformers provide accurate, dependable current sensing for electrical metering, energy monitoring, switchgear, and protection systems. Available in multiple sizes, mounting styles, primary-current ratings, and secondary-output configurations, the portfolio supports both compact installations and high-current power-distribution applications.

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Reliable Current Sensing Across Demanding Applications

 Current transformers reduce high primary currents to standardized, measurable secondary signals that can be safely used by meters, monitoring equipment, relays, and control systems. The product family includes 600V current transformers in 6.5-inch and 7.5-inch sizes, along with toroidal and encapsulated measuring current transformers engineered for precise measurement and dependable operation in demanding electrical environments. The measuring CT portfolio supports primary currents of 100A, 400A, 800A, and 1000A, with standardized 1A or 5A secondary outputs and accuracy classes ranging from 0.1 to 0.2S. 

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Explore Our Current Transformer Solutions 

Astrodyne TDI current transformers deliver precise current measurement with accuracy classes as low as 0.1, supporting reliable metering, monitoring, and protection applications. Available in a wide range of primary currents, secondary outputs, burdens, sizes, and mounting options, they offer the flexibility to meet diverse system requirements. Designed for long-term reliability, these transformers feature high dielectric strength with a 10kV BIL insulation level, rugged low-maintenance construction, and compliance with IEC 61869-2 and IEEE C57.13 standards.
 
2 CT 6.6, 6.7

600V Current Transformer – 6.5-Inch 

 6.5-inch, 600V current transformer designed for accurate current sensing in compact electrical distribution, power monitoring, switchgear, and industrial control applications. 

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2 CT 6.6, 6.7

 600V Current Transformer – 7.5-Inch 

7.5-inch, 600V current transformer engineered for high-current electrical distribution, busbar monitoring, industrial switchgear, and energy management applications requiring a larger conductor opening.

 

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Encapsulated Measuring Current Transformer (6)

Encapsulated Measuring Current Transformers

Encapsulated measuring current transformers designed for accurate current sensing, featuring a rugged enclosed design, primary currents from 100A to 1000A, accuracy classes down to 0.1, and compliance with IEC 61869-2 and IEEE C57.13 standards.

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Toroidal Measuring Current Transformer (1)

Toroidal Measuring Current Transformers 

Toroidal measuring current transformers feature an open-center design for easy conductor installation, delivering accurate current measurement with primary ratings up to 1000A, low phase-angle error, and compliance with IEC 61869-2 and IEEE C57.13 standards. 

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Looking for a modular solution? Check out our *New* FLEX Series

 

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Typical Applications for Current Transformers

Astrodyne TDI current transformers are designed for use across: 

Energy-management systems

The Perfect Fit For

  • Low- and medium-voltage switchgear
  • Switchboards and electrical panels
  • Utility and energy-company equipment
  • Data-center power distribution
  • Metering equipment
  • Energy-management systems
  • Protection relays
  • Industrial control equipment
  • Busbar monitoring
  • Power-quality systems

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Product Family Comparison

Product Family Primary Purpose Available Configuration Highlights Best-Suited Applications
6.5-Inch 600V Current Transformer Compact current sensing Compact 600V design Space-constrained panels and distribution equipment
7.5-Inch 600V Current Transformer Larger-format current sensing Larger opening and added application capacity Busbars and larger high-current systems
Encapsulated Measuring CT Protected precision measurement 100–1000A primary; 1A or 5A secondary; up to 25 VA Metering, switchgear and protection
Toroidal Measuring CT Open-center precision measurement 100–1000A primary; multiple accuracy classes Panels, switchboards, meters and energy monitoring

Why Choose Astrodyne TDI Current Transformers?

Astrodyne TDI combines transformer engineering expertise with configurable electrical and mechanical options to meet demanding measurement and protection requirements. Standard and application-specific current transformer designs help OEMs simplify integration, achieve accurate measurement, and support dependable system performance.

Our engineering team can assist with:

  • Primary- and secondary-current selection
  • Accuracy-class requirements
  • Burden requirements
  • Conductor and busbar opening dimensions
  • Mounting configuration
  • Insulation requirements
  • Custom current transformer designs

Our Certifications

ISO 9001:2015

General Quality Management

AS9100D

Aerospace Quality Standard

ISO 13485:2016

Medical Device Quality

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