Instrument CAT 780-801 current transformer with a 400:5 ratio converts a high primary current into a 5 A secondary for metering and protection circuits. It supports 50–400 Hz operation and provides a 600 V insulation rating with a 10 kV BIL, enabling safe use in industrial power systems and ensuring adequate dielectric strength for impulse events. Typical applications include electrical panels, motor control centers, and power distribution gear where precise current sensing and galvanic isolation are required.
