Current Transformer Types

Different Current Transformer Types

In this blog we will go over the different types of Current Transformers available in the market. in a seperate blog which we will link to we will discuss the Burden or Losses which you need tobe aware of when installing Current Transformers (CT's)

Why so many CT Types?

People often wonder and get confised why there are so many different types, sizes and ratings for Current Transformers. The answer is simply that there are almost endless applications for current transformers. From Power Metering, Energy Monitoring, Power Quality Aanalysis, to Power Control and Safefty Systems, each application can have different accuracy, sizing, and other physical requirements.

Overview of CT Types in the market.

In this table we have listed the main applications we are involved with. This is by no means every applications and is intended to give you an idea of the different styles of CT's.

0.333V CT's and Rogowski Coils were intedned for US based Equipment, and in the past all Rogowski Coils were only availale in 0.333V. Nowadays 1 Amp, or 5 Amp Rogowski Coils are available, however in many cases the unit costs are prohibitive. For new installations we highly reccommend to use Large Split Cores CT's. 

You can clik on the image of each range to open up the available range in our store. There you will find detailed specifications along with matching datasheets. 

The majority of our CT's are ROHS, UL, and CE Approved. If in doubt feel free to ask our sales team. 

Current Transformer Type	Advantages	Image	Available Range
Resin Cast Split Core	Accuracy to Class 0.5, High VA Rating		100Amp - 5000Amp
Resin Cast Solid Core	Accuracy to Class 0.2, High VA Rating, Low Cost		1Amp - 7500Amp
Encapsulated Split Core 1/5 Amp	Accuracy to Class 0.5, Rugged, Low Cost		100Amp - 5000Amp
Encapsulated Solid Core 1/5 Amp	Accuracy to Class 0.5, Rugged, Low Cost, Compact		40Amp - 500 Amp
Encapsulated Small Split Core 5Amp	Accuracy to Class 1 over Short Distances, Low Cost, Compact		50Amp - 300Amp
Encapsulated Small Split Core 0.333V	Accuracy to Class 1 over Short Distances, Low Cost, Compact		50Amp - 300Amp
Encapsulated Split Core Low Cost 0.333V	Accuracy to Class 1 over Short Distances, Low Cost, Compact		5Amp - 2000Amp
Clip Split Core 5 Amp	Accuracy to Class 1, Low Cost, Easy to install		100Amp - 800 Amp
Rogowski Coil & Integrator- Resitance Based 5 Amp	Accuracy to Class 1, Easy to install, Integrator Matched to Coil		500Amp - 5000Amp (User Selectable)
Rogowski Coil & Integrator - Resitance Based 0.333V	Accuracy to Class 1, Easy to install, Integrator Matched to Coil		500Amp - 3000Amp (Higher ratings on request)
Rogowski Coil - Resitance Based	Accuracy to Class 1, Easy to install, requires matched integrator/meter		50 - 30,000 Amp
LEM Rogowski Coil & Integrator - Ferrite Core, 0.333v, 0.166v, 4-20mA, 0-20mA, 0-5V, 0-10V	Highest Accuracy to Class 0.5, Easy to install, Integrator suits and LEM Coil, Low interference		100 - 5000 Amp (User Selectable)
LEM Rogowski Coil & Integrator - Ferrite Core 1 Amp	Highest Accuracy to Class 0.5, Easy to install, Integrator suits and LEM Coil, Low interference		100 - 5000 Amp (User Selectable)
LEM Rogowski Coil - Ferrite Core	Highest Accuracy Coils on the market, Class 0.5, Easy to install, Suits any LEM integrator		20Amp - Unlimited
Resin Cast Protection Class CT	Fast Response, 60 x In Overload for 1 sec		100Amp - 5000Amp

In addition, there is a wide range of CT's and Hall Effect Sensors with Process Output. We will cover those types in a seperate blog as they apply to the process and power automation markets.   

Fro applications advice see our blog on CT Cable Losses to ensure you final system accuracy is as intended