Split Core AC Current Sensor Transformer 10A 20A 30A 50A

The AC Current Sensor Non-Invasive Split Core Transformer is a versatile, easy-to-install current sensing solution designed for energy monitoring, home automation, and electrical measurement projects. With its split-core design, you can clamp it around an existing wire without cutting or interrupting the circuit — making installation clean, safe, and non-invasive.

Built with a high-permeability ferrite core for excellent mechanical strength and measurement accuracy, this transformer is compact at just 13mm × 13mm and supports multiple current ranges — 10A, 20A, 30A, and 50A — so you can choose the right spec for your application. It offers two output forms: current output and voltage output (with built-in sampling resistor), giving you flexibility to connect directly to microcontrollers, data loggers, or energy meters. Available in 3 color options to suit your setup.

Key Features

• Non-invasive split-core design — clamp onto existing wiring without cutting or rewiring
• Multiple current ranges: 10A, 20A, 30A, and 50A to match a variety of AC circuits
• Dual output options: current output or voltage output (built-in sampling resistor)
• High-permeability ferrite core for strong mechanical durability and low non-linearity (≤3%)
• Compact footprint: 13mm × 13mm — fits in tight spaces and panel installations
• Compatible with microcontrollers such as Arduino, Raspberry Pi, and PLC systems
• Available in 3 color variants for easy circuit identification

Specifications

• Core Material: Ferrite
• Core Size: 13mm × 13mm
• Current Ranges: 10A / 20A / 30A / 50A
• Non-linearity: ≤3%
• Output Type: Current output & Voltage output (with sampling resistor)
• Design: Split-core (non-invasive)

Ideal Applications

• Home energy monitoring systems
• Smart home and IoT automation projects
• Industrial current measurement and logging
• DIY electronics and microcontroller projects
• Power quality analysis

For guidance on electrical safety standards and safe practices when working with AC circuits, refer to the OSHA Electrical Safety guidelines.

Frequently Asked Questions

Q: What is a non-invasive split-core current sensor transformer and how does it work?

A: A non-invasive split-core current sensor transformer clamps around an existing AC wire without cutting or interrupting the circuit. It uses electromagnetic induction — as AC current flows through the wire, it generates a proportional magnetic field, which the ferrite core captures and converts into a measurable output current or voltage signal. This makes it safe, easy to install, and ideal for energy monitoring and automation projects.

Q: What current ranges are available, and how do I choose the right one?

A: This sensor is available in 10A, 20A, 30A, and 50A ranges. Choose a range that matches or slightly exceeds the maximum current you expect to measure on your circuit. For example, use the 10A variant for low-power appliances and the 50A variant for higher-load circuits like HVAC units or large appliances. Selecting the correct range ensures the best accuracy and measurement resolution.

Q: Is this current sensor compatible with Arduino or Raspberry Pi?

A: Yes — the voltage output version (with built-in sampling resistor) can connect directly to the analog input pins of microcontrollers like Arduino or Raspberry Pi. This makes it a popular choice for DIY energy monitors, smart home projects, and IoT data logging systems. The current output version is better suited for use with dedicated current measurement circuits or PLCs.

Q: What does the ferrite core contribute to this sensor's performance?

A: The ferrite core provides high magnetic permeability, excellent mechanical strength, and low energy loss. This results in accurate current measurement with a non-linearity of ≤3%, meaning readings closely reflect the actual current flowing through the monitored conductor — even at lower current levels.