A split core CT (Current Transformer) is a current transformer that is designed to be physically opened, and installed without shutting the circuit. It is fully insulated from the high operating voltage of the system and is usually hanged to the current carrying wires.

DER EE split core current transformers are used to measure AC (alternating current) and their secondary currents are usually proportional to the primary currents. With features of lightweight, safe, and convenient, users don't need to shut off the circuit or cut a wire during measurement. They are widely used on industrial controls, and electrical systems for troubleshooting, circuit test, or maintenance.