This non-invasive current sensor (also known as a split-core current transformer) clamps around the supply line of an electrical load to measure how much current is flowing through it. The sensor acts as an inductor, responding to the magnetic field around a current-carrying conductor, and outputs a proportional current that can be read by a microcontroller.

Rated for up to 30 A, this sensor is well suited for building your own energy monitor, tracking household power usage, or creating an over-current protection system for AC loads.

Key Features

• Non-Invasive – Clamp-on design requires no wire cutting or electrical contact
• 30 A Maximum – Suitable for monitoring typical household circuits
• Split-Core Design – Easy to install around existing wiring
• No Built-In Load Resistor – Place a burden resistor across the output to convert induced current to a measurable voltage

Ideal For

• DIY home energy monitoring systems
• Over-current detection and protection circuits
• Arduino and microcontroller-based power logging projects

Resources

• Datasheet (PDF)
• Arduino Energy Monitor Guide (OpenEnergyMonitor)
• Environmental Monitoring with the Tessel 2 (SparkFun)