600A/0.333V KCT Split Core Current Transformer: The Ultimate Guide

Introduction to Split Core Current Transformers

What is a Split Core Current Transformer?

A split core CT is a device used to measure alternating current (AC) by isolating it and scaling it down to a manageable level. Unlike traditional CTs, it can be "split" open to wrap around a live conductor—no need to shut down your system.

Why Use a Split Core CT?

The Advantage of Easy Installation

Split core CTs allow you to install without disconnecting power cables. Just snap it open, clamp it on, and you're ready to go.

Enhanced Safety and Monitoring

They isolate high voltages and protect monitoring devices, ensuring safer and more reliable operation.

Overview of the 600A/0.333V KCT Split Core Current Transformer

Key Specifications

Input and Output Range

Rated input is 5A–200A, and the output is 0–33.3mV AC or 0–5A and 4–20mA DC. It can handle up to 600A while outputting a standard 0.333V signal.

Accuracy Grades

Available in accuracy classes 0.2s, 0.5, and 1.0 for reliable measurements in precision-critical systems.

Frequency Compatibility

Operates over a wide frequency range: 50Hz to 2KHz, suitable for industrial and commercial environments.

Design and Build Materials

Core Composition

Constructed with high-grade silicon steel to ensure excellent magnetic performance and low losses.

Bobbin and Case

The bobbin is made of durable PBT, and the outer case meets UL94-V0 safety standards for flame retardancy.

Internal Epoxy Structure

The epoxy-filled internal construction adds robustness and enhances insulation.

Installation and Connection

Split Core Design Benefits

No need to disconnect power cables. The split core opens and closes securely for fast, safe installation.

Terminal Connections (S1 & S2)

Features insulated and labelled S1 and S2 terminals, making connections straightforward and secure.

Directional Flexibility and Indoor Use

Supports installation in any orientation, optimised for indoor use with no condensation allowed.

Application Areas

• Monitoring electrical equipment
• HVAC, lighting, and industrial automation
• Charging stations
• Data centres
• Relay protection systems

Models and Variants Explained

Understanding the KCT-6 to KCT-36 Range

Model-Specific Current Ratios

From 5A/2.5mA (KCT-6) to 600A/60mA (KCT-36), there’s a CT for every power application.

Maximum Current Handling

Models can handle up to 720A depending on specifications.

Turns Ratio and Output Types

Options include 2000:1, 3000:1 and even 10000:1 turns ratio with outputs in mA, A, or 0.333V.

Electrical Performance Parameters

• Dielectric strength: 2.5KV for 1 minute
• Insulation resistance: DC500V / 100MΩ minimum
• Phase angle error: ≤ ±60min
• Load resistance: 20Ω to 400Ω depending on model

Mechanical and Environmental Specs

• Operating temperature: -20°C to +50°C
• Storage temperature: -30°C to +50°C
• Humidity: ≤85% RH (no condensation)
• Complies with CATIII insulation category

Differences Between Split Core and Other CTs

Closed CTs

Higher accuracy but require cable disconnection during installation.

Window CTs

Simple but less flexible for existing systems.

Pole Type CTs

Designed for outdoor, pole-mounted applications—less suitable for indoor panels.

How a CT Works: Simplified

Magnetic Induction Explained

AC current flowing through a conductor generates a magnetic field that induces a secondary current in the CT.

The Primary and Secondary Winding System

The primary conductor acts as one winding, and the CT’s internal coil as the secondary—scaling down the current proportionally.

Common Challenges and Solutions

Dealing with Phase Errors

Keep wire runs short and ensure proper orientation to reduce phase shift errors.

Reducing Magnetic Interference

Install away from high EMI sources and ensure proper shielding.

Choosing the Right CT for Your Setup

• Match CT to your system's max current and load range
• Verify environmental specs (temp/humidity)
• Ensure output format is compatible with your monitoring device

Safety Considerations

Insulation Ratings and Certifications

UL94-V0 materials and CATIII rated insulation provide a high level of safety.

Best Practices During Installation

Always follow guidelines and, where possible, power down during installation for extra safety.

Integration with Energy Monitoring Devices

Compatibility with kWh Meters

Works seamlessly with digital and analogue meters, especially energy monitoring platforms like eGauge.

Plug Types and Cable Options

Supports audio, power and wired plug types for easy integration.

Cost-Efficiency and Maintenance

Longevity of Components

High-grade materials ensure long-term reliability with minimal maintenance required.

Ease of Replacement and Upgrades

Modular design makes it simple to swap or upgrade units as needed.

Conclusion

The 600A/0.333V KCT Split Core Current Transformer is a reliable, efficient, and easy-to-install solution for current monitoring across multiple applications. Its design prioritises safety, accuracy, and flexibility—making it an ideal choice for modern energy systems like eGauge installations.

Frequently Asked Questions (FAQs)

1. What is the difference between 0.333V and 5A output in CTs?

0.333V is used for voltage-based digital meters, while 5A is a current signal for traditional analogue devices.

2. Can I install this CT on a live wire?

Yes, but it’s always safer to install with the power turned off.

3. Is the 600A CT compatible with solar inverters?

Yes, especially for AC side monitoring in grid-tied solar systems.

4. How often does a CT need maintenance?

Rarely—just inspect yearly for loose terminals or physical wear.

5. What happens if I install it backwards?

The polarity will be reversed, causing the readings to appear negative. Simply swap S1 and S2 wires to correct it.