Split Core Current Transformers for Energy Monitoring and Retrofit Installations

Introduction

Modern energy monitoring systems often need current measurements without interrupting existing electrical circuits.

In retrofit projects, shutting down equipment to install traditional current transformers can be costly and time-consuming.

Split core current transformers solve this problem by allowing installation directly around existing cables or busbars without disconnecting conductors.

At FERRTX, our SCTK731, SCTK732A, SCTK751, and SCTK831 series are designed for energy monitoring, power management, industrial automation, and electrical protection applications where fast installation and reliable measurement are required.

Why Choose Split Core Current Transformers?

Traditional current transformers require cables to be disconnected before installation.

For existing electrical systems, this often means:

• Production downtime
• Increased labor cost
• Safety risks
• Longer maintenance windows

Split core current transformers eliminate these challenges.

The hinged core structure allows the Transformer to be opened, clamped around the conductor, and secured within minutes.

Benefits include:

• No cable disconnection required
• Faster installation
• Lower maintenance cost
• Improved safety
• Ideal for retrofit projects

Key Design Features

Easy Retrofit Installation

The SCTK731 and SCTK831 series use screw-fastening structures that provide secure installation on large conductors and busbars.

Wide Window Sizes

Window openings support a broad range of conductor sizes.

Examples include:

These options allow installation from small feeder circuits to large industrial busbars.

Multiple Output Options

Depending on system requirements, outputs include:

• 1A
• 5A
• 333mV
• 500mA

The SCTK732A series supports 0.333V output commonly used in modern energy management systems and power analyzers.

High Accuracy Measurement

SCTK732A provides accuracy classes down to:

• Class 0.2
• Class 0.5
• Class 1.0

with phase angle error as low as ±10 minutes. 

Typical Applications

Split core current transformers are widely used in:

• Energy monitoring systems
• Building automation systems
• Smart metering projects
• Industrial control systems
• Power distribution monitoring
• Motor protection systems
• HVAC monitoring
• Electrical protection relays

FAQ

What is a split core current transformer?

• A split core current transformer features an opening magnetic core that allows installation around existing conductors without disconnecting cables.

Why use a split core CT instead of a solid core CT?

• Split core CTs significantly reduce installation time and eliminate system downtime during retrofit projects.

What output options are available?

• Common outputs include 1A, 5A, 333mV, and 500mA depending on the application requirements.

Can split core CTs be used for energy monitoring?

• Yes. The SCTK732A series is particularly suitable for power analyzers, energy management systems, and building monitoring applications.

How accurate are FERRTX split core current transformers?

• Depending on the model, accuracy classes are available from Class 0.2 to Class 3.0.