This document discusses magneto optical current transformers (MOCTs). MOCTs use the Faraday effect to measure current optically without breaking the current path. They have several advantages over conventional current transformers, such as providing insulation, withstanding high fault currents without saturation, and having no electromagnetic interference. A MOCT consists of a sensor head near the current carrying conductor that uses polarized light, a signal processing unit, and fiber optic cables connecting them. The sensor measures the rotation of the light's polarization due to the Faraday effect to determine current magnitude. MOCTs are well-suited for outdoor applications and provide more accurate current measurements than conventional transformers.