Instrument 780-122 is an instrument transformer (current transformer) with a primary-to-secondary ratio of 1200:5 A. It is used to step down high currents in electrical power systems for metering and protection equipment, providing a 5 A secondary signal for accurate measurement and relay inputs. The 780-122 model is designed to interface high-current circuits with standard current-sensing equipment, enabling safe monitoring and control within distribution panels and related infrastructure.
