Current transformers (CTs) are essential electrical devices used to measure alternating current (AC) by stepping down high currents to a safe, measurable level. They are widely employed in power distribution, energy monitoring, and protective relaying systems. CTs feature high accuracy, insulation durability, and compact designs, making them ideal for industrial applications such as substations, motor control centers, and metering equipment. Available in various types (e.g., split-core, solid-core, Rogowski coils), they ensure safe current measurement without interrupting the circuit.