Schneider Electric 120R-302 Current Transformer

Schneider Electric's Square D 120R-302 is a toroidal current transformer with a 3000:5 primary-to-secondary ratio, designed to sense high currents by passing a conductor through its core and delivering a standard 5 A secondary signal. It operates over a frequency range of 25 to 400 Hz, enabling accurate current measurement in a variety of power-distribution and industrial environments where frequency may deviate from the nominal 50 or 60 Hz. As a Square D by Schneider Electric product, the 120R-302 provides a compact, reliable means to translate large line currents into a safe, easily monitored 5 A output for metering, monitoring, or protective equipment in appropriate installations. With a 3000 A primary rating implied by the ratio, the secondary current scales linearly for any given primary current, so a primary current of 600 A would produce roughly 1 A on the secondary, and 3000 A would yield 5 A. This model is part of the 120R family of current transformers, commonly used where a single-turn primary conductor passes through the core to achieve precise current sensing without introducing significant burden in the power path.