Best Current Transformer Clamps

Looking for the best current transformer clamps? We’ve got you covered with a curated list of the top 10 options tailored to your needs.

Current transformer clamps are essential tools for monitoring electrical currents safely and efficiently. They allow you to measure power usage without cutting wires, making them perfect for home projects and professional setups. Whether you’re tracking energy or protecting equipment, these clamps are reliable and easy to use.

Discover the best current transformer clamps tailored to your needs. From DIY-friendly designs to heavy-duty models, this guide ensures you find the perfect fit for accurate and safe measurements.

List of Top 10 Current Transformer Clamps

Title	Best For	Price
AC Current Sensor Transformer, Core Current Transformer Coil Sensor for 100A Amp Energy Meter	This AC Current Sensor Transformer is perfect for anyone needing easy, safe current monitoring in industrial or building settings. It’s ideal for retrofits, maintenance, or temporary testing without cutting power.	View on Amazon (paid link)
Current Transformer ZCZQC Blue SCT-013 0-100A Non-invasive AC Current Sensor Split-Core Clamp Open-Close Current Transformer	This Current Transformer is perfect for anyone needing to measure AC current up to 100A in lighting, motors, or compressors. Its compact design and easy setup make it ideal for monitoring and protecting your equipment.	View on Amazon (paid link)
Amprobe – 3026809 CT235A Clamp Accessory Current Transformer	The Amprobe CT235A Clamp Accessory Current Transformer is perfect for electricians and technicians who need to measure high AC/DC currents up to 1000 A. Its zero adjust knob makes it easy to get accurate readings every time.	View on Amazon (paid link)
Fluke 17xx i40s-EL 40A Clamp-on Current Transformer	The Fluke 17xx i40s-EL 40A Clamp-on Current Transformer is perfect for professionals who need to measure current in electrical systems. It’s ideal for use with Fluke three-phase tools, making it great for loggers, analyzers, and recorders.	View on Amazon (paid link)
AC Current Sensor Transformer, Core Current Transformer Coil Sensor for 200A Amp Energy Meter	This AC Current Sensor Transformer is perfect for anyone needing easy, safe current monitoring in industrial or building settings. It’s ideal for retrofits, online monitoring, and temporary testing without cutting power or using complex tools.	View on Amazon (paid link)
DENT Instruments Clamp On Current Transformer	The DENT Instruments Clamp On Current Transformer is perfect for anyone using the ELITEpro Series. It’s safe, easy to use, and works with one hand.	View on Amazon (paid link)
Fluke 17xx i40s-EL/3pk Clamp-on Current Transformers	The Fluke 17xx i40s-EL/3pk Clamp-on Current Transformers are perfect for electricians and technicians who need to measure current in three-phase systems. They are ideal for use with Fluke loggers, analyzers, and recorders, making them a great choice for professionals.	View on Amazon (paid link)
JANSANE SCT-013-000 100A Non-invasive AC Current Sensor Split-Core Clamp Current Transformer	This JANSANE SCT-013-000 100A Non-invasive AC Current Sensor is perfect for DIY enthusiasts and makers who want to monitor energy usage or build their own devices. It’s great for projects with Arduino or Raspberry Pi, helping you track power consumption or protect AC loads easily.	View on Amazon (paid link)
Fluke I40S-EL3X/3PK 40A Clamp-on Current Transformer 3-Pack	The Fluke I40S-EL3X/3PK is perfect for electricians and technicians who need to measure low currents accurately. It’s ideal for small conductors and comes in a pack of 3, making it great for multiple projects.	View on Amazon (paid link)
Reland Sun SCT-013-000 10A 20A 30A 50A 100A Non-invasive AC Current Sensor Split-Core Clamp Current Transformer (50A-1V)	This AC current sensor is perfect for DIY enthusiasts and homeowners who want to monitor energy usage or build their own devices. It’s easy to use and great for projects like energy monitors or over-current protection.	View on Amazon (paid link)

Detailed Reviews

Discover the top 10 Current Transformer Clamps in this expert-reviewed guide. Each product is carefully selected based on performance, features, and value. Whether you need precision, safety, or affordability, this guide has you covered. Find the perfect clamp to meet your needs and boost your confidence in making the right choice.

1. AC Current Sensor Transformer, Core Current Transformer Coil Sensor for 100A Amp Energy Meter

Monitor current without cutting power. This split-core sensor installs easily on existing cables. It works with ammeters, energy meters, and PLCs.

Quick setup saves time. Safe design protects equipment and people.

Pros	Cons
No power cuts needed for easy installation and monitoring. Split core design allows quick setup without cable threading. Accurate and compatible with 50A to 1000A circuits. Safe operation with high-voltage protection for equipment and users.	Limited to AC circuits, not for DC applications. Inner diameter of 24mm may not fit all cable sizes. No built-in display, requires external devices for readings.

Perfect For:

This AC Current Sensor Transformer is perfect for anyone needing easy, safe current monitoring in industrial or building settings. It’s ideal for retrofits, maintenance, or temporary testing without cutting power.

Ready to Purchase?

View Price on Amazon (paid link)

2. Current Transformer ZCZQC Blue SCT-013 0-100A Non-invasive AC Current Sensor Split-Core Clamp Open-Close Current Transformer

The Current Transformer ZCZQC Blue SCT-013 is a non-invasive AC current sensor designed for 0-100A AC measurements. Its split-core clamp allows easy installation without cutting wires, making it safe and convenient.

It features a 1m lead wire, 3.5 mm cable jack, and two output forms: current or voltage (with added resistance). Its compact design and smooth surface ensure durability and ease of use.

This sensor is ideal for lighting, motors, and compressors, offering accurate monitoring and overcurrent protection. The package includes one sensor, ready for immediate use.

Pros	Cons
Measures up to 100A AC with non-invasive design. Compact and smooth, fits anywhere with easy installation. Two output options: current or voltage for flexible use. Wide applications, ideal for motors, lights, and protection.	No built-in load resistance for voltage output. Short lead wire length (1m) may limit setup. No mounting accessories included for installation.

Perfect For:

This Current Transformer is perfect for anyone needing to measure AC current up to 100A in lighting, motors, or compressors. Its compact design and easy setup make it ideal for monitoring and protecting your equipment.

Ready to Purchase?

View Price on Amazon (paid link)

3. Amprobe – 3026809 CT235A Clamp Accessory Current Transformer

The Amprobe CT235A Clamp Accessory is a current transformer designed for AC/DC current measurements. It works with clamp meters to measure high currents accurately.

This accessory can handle up to 1000 A, making it ideal for heavy-duty tasks. The zero adjust knob ensures precise readings every time.

Easy to use. Reliable performance. Great for professionals.

Pros	Cons
Measures AC/DC currents up to 1000 A with precision. Zero adjust knob ensures accurate readings every time. Clamp design allows easy, hands-free current testing. Versatile tool for professionals and DIY enthusiasts.	No auto-ranging feature, manual adjustments needed. Limited to 1000 A, not for higher current tasks. Basic design, lacks advanced safety features.

Perfect For:

The Amprobe CT235A Clamp Accessory Current Transformer is perfect for electricians and technicians who need to measure high AC/DC currents up to 1000 A. Its zero adjust knob makes it easy to get accurate readings every time.

Ready to Purchase?

View Price on Amazon (paid link)

4. Fluke 17xx i40s-EL 40A Clamp-on Current Transformer

The Fluke 17xx i40s-EL is a clamp-on current transformer designed for easy use. It measures currents from 40 mA to 40 A, making it versatile for various tasks. This tool works best with Fluke three-phase devices like loggers and analyzers.

It’s simple to use and reliable, ensuring accurate readings every time. Perfect for professionals needing a dependable current transformer.

Pros	Cons
Clamp-on design for easy, safe current measurements. Wide range measures from 40 mA to 40 A. Works seamlessly with Fluke three-phase tools. Accurate and reliable for professional use.	Limited to Fluke devices, not universal compatibility. No built-in display, relies on external tools. Higher cost than basic clamp meters.

Perfect For:

The Fluke 17xx i40s-EL 40A Clamp-on Current Transformer is perfect for professionals who need to measure current in electrical systems. It’s ideal for use with Fluke three-phase tools, making it great for loggers, analyzers, and recorders.

Ready to Purchase?

View Price on Amazon (paid link)

5. AC Current Sensor Transformer, Core Current Transformer Coil Sensor for 200A Amp Energy Meter

The AC Current Sensor Transformer is a split-core coil sensor designed for 200A energy meters. It offers no-power-cut monitoring, making it ideal for live retrofits and temporary testing.

Its detachable core design avoids cable threading or power-off during installation. It’s easy to install and disassemble, saving time and effort. Perfect for fixed cables in cable trays or existing circuits.

With accuracy classes from 0.5 to 1, it meets daily current measurement needs. It supports 50A to 1000A and works with low-voltage circuits. Ensures stable operation and safety in industrial and building applications.

Pros	Cons
No power cuts needed for easy and safe installation. Split core design fits existing cables without threading. Accurate and compatible with common devices. Quick setup in under 5 minutes, no tools required.	Limited to low-voltage circuits, not for high-voltage use. No built-in display, requires external devices for readings. Inner diameter of 24mm may not fit all cable sizes.

Perfect For:

This AC Current Sensor Transformer is perfect for anyone needing easy, safe current monitoring in industrial or building settings. It’s ideal for retrofits, online monitoring, and temporary testing without cutting power or using complex tools.

Ready to Purchase?

View Price on Amazon (paid link)

6. DENT Instruments Clamp On Current Transformer

The DENT Instruments Clamp On Current Transformer is a handy tool for energy monitoring. It works perfectly with the ELITEpro Series, making it a great addition to your setup.

This transformer has a 25 mm window and unterminated leads. It provides a safe millivolt output and is easy to use.

With its one-handed operation, this tool is simple and efficient. It’s designed for convenience, ensuring quick and accurate results.

Pros	Cons
Works with ELITEpro Series for seamless integration. Safe millivolt output ensures secure operation. One-handed operation makes it easy to use. 25 mm window fits most applications effortlessly.	Limited to DENT ELITEpro Series, not universal. Unterminated leads require extra setup for use. Small window may not fit larger cables.

Perfect For:

The DENT Instruments Clamp On Current Transformer is perfect for anyone using the ELITEpro Series. It’s safe, easy to use, and works with one hand.

Ready to Purchase?

View Price on Amazon (paid link)

7. Fluke 17xx i40s-EL/3pk Clamp-on Current Transformers

The Fluke 17xx i40s-EL/3pk Clamp-on Current Transformers are designed for precision. They work with Fluke three-phase devices, making them a reliable choice for professionals.

This 3-pack offers a wide range, from 40 mA to 40 A, and is made in Romania. It’s easy to use and built to last.

Pros	Cons
Wide range measures from 40 mA to 40 A easily. 3-pack offers great value for multiple uses. Perfect match for Fluke three-phase tools. Reliable quality, proudly made in Romania.	Limited to specific Fluke devices, not universal compatibility. No built-in display for direct readings. Made in Romania, may impact delivery time for some.

Perfect For:

The Fluke 17xx i40s-EL/3pk Clamp-on Current Transformers are perfect for electricians and technicians who need to measure current in three-phase systems. They are ideal for use with Fluke loggers, analyzers, and recorders, making them a great choice for professionals.

Ready to Purchase?

View Price on Amazon (paid link)

8. JANSANE SCT-013-000 100A Non-invasive AC Current Sensor Split-Core Clamp Current Transformer

The JANSANE SCT-013-000 is a 100A non-invasive AC current sensor. It measures alternating current easily. Use it for whole-building energy tracking.

This split-core clamp works great for DIY projects. It pairs well with Arduino and Raspberry Pi. Build your own energy monitor or over-current protector.

The sensor has a 1m wire and 3.5mm jack. It offers current or voltage output. Use it for motors, lighting, or compressors.

Pros	Cons
Measures AC current for whole-building use. Perfect for DIY projects with Arduino and Raspberry Pi. Build your own energy monitor or over-current protection. Versatile for lighting, motors, and compressors.	No built-in burden resistor for voltage output. Short 1m wire may limit installation options. DIY setup required, not plug-and-play.

Perfect For:

This JANSANE SCT-013-000 100A Non-invasive AC Current Sensor is perfect for DIY enthusiasts and makers who want to monitor energy usage or build their own devices. It’s great for projects with Arduino or Raspberry Pi, helping you track power consumption or protect AC loads easily.

Ready to Purchase?

View Price on Amazon (paid link)

9. Fluke I40S-EL3X/3PK 40A Clamp-on Current Transformer 3-Pack

The Fluke I40S-EL3X/3PK is a 3-pack of 40A clamp-on current transformers. These tools are perfect for low current measurement, making them ideal for precise work. They are easy to use and reliable.

These transformers measure accurately on 1 A and 5 A secondary current transformers. They can clamp onto conductors up to 15mm in diameter, giving you flexibility in your measurements.

Pros	Cons
Accurate low current measurement up to 40A. Clamp onto conductors up to 15mm easily. Pack of 3 for great value and convenience. Works well with 1A and 5A transformers.	Limited to low currents, not for high-power applications. No built-in display, requires external device for readings. Clamp size restricts use on larger conductors.

Perfect For:

The Fluke I40S-EL3X/3PK is perfect for electricians and technicians who need to measure low currents accurately. It’s ideal for small conductors and comes in a pack of 3, making it great for multiple projects.

Ready to Purchase?

View Price on Amazon (paid link)

10. Reland Sun SCT-013-000 10A 20A 30A 50A 100A Non-invasive AC Current Sensor Split-Core Clamp Current Transformer (50A-1V)

The Reland Sun SCT-013-000 is a non-invasive AC current sensor designed to measure alternating current. It’s perfect for tracking whole-building energy use or generation.

This split-core clamp is DIY-friendly and works great for energy monitoring. Use it to reduce power usage or protect AC loads from over-current.

It offers current or voltage output and fits lighting, motors, and compressors. The 3.5mm cable jack makes it easy to connect.

Pros	Cons
Measures whole building energy use with ease. Perfect for DIY energy monitors or protection devices. Flexible output options: current or voltage. Versatile use for motors, lights, and compressors.	No built-in display for direct current readings. Requires extra parts like a burden resistor for voltage output. Not for DC, only measures alternating current.

Perfect For:

This AC current sensor is perfect for DIY enthusiasts and homeowners who want to monitor energy usage or build their own devices. It’s easy to use and great for projects like energy monitors or over-current protection.

Ready to Purchase?

View Price on Amazon (paid link)

Buying Guide

Current transformer clamps are essential tools for safe and accurate electrical measurements. They help you monitor power usage without cutting wires, making them perfect for home and professional use.

When choosing the best current transformer clamp, consider these key factors:

Current Range: Pick a clamp that matches your needs. For example, 40A clamps are great for low currents, while 100A or 200A models handle heavier loads.
Type of Core: Split-core clamps are easy to install on existing wires, while solid-core clamps are more compact but require cutting wires.
Output Type: Decide if you need current or voltage output. Some clamps offer both with added resistance.
Compatibility: Ensure the clamp works with your devices, like energy meters, PLCs, or Arduino.
Ease of Use: Look for features like quick setup, detachable cores, or one-handed operation for convenience.
Accuracy: Choose a clamp with a high accuracy class (e.g., 0.5 to 1) for reliable measurements.
Durability: Opt for clamps with compact designs and smooth surfaces for long-lasting use.
Safety: Non-invasive clamps are safer as they don’t require cutting wires or powering off circuits.

With these factors in mind, you’ll find the perfect current transformer clamp for your needs. Whether for DIY projects or heavy-duty tasks, the right clamp ensures accurate and safe measurements every time.