Square outer shape, integrated mounting feet single piece current transformer. The 1411 series is a full line of low-voltage current transformers (CTs) for various power measurement devices and applications. Power measurement devices include protective relays, analog devices, transducers and power monitors. The purpose of CTs is to scale high currents to more manageable levels, while preserving a reasonable level of accuracy. CTs typically scale the currents flowing through their primaries to 5 A (full scale) on their secondaries. The majority of power measurement devices are designed to accept this current level.