Simpson Electric Co. A 01297 Current Transformer

Simpson Electric Co. A 01297 Current Transformer is an AC instrument transformer with a primary-to-secondary current ratio of 100:5 A, meaning a 100-ampere primary yields a 5-ampere secondary current and enabling safe, scaled measurement of higher currents. It is specified to operate across a 50–400 Hz frequency range and is rated for use in circuits up to 600 V, defining its insulation and compatibility with typical power systems. With a 100 A primary, the 5 A secondary output provides a standard signal level for connection to metering equipment, protection relays, and instrumentation that monitor current without exposing sensing devices to full line current. Current transformers perform the task of producing a proportional, lower-current signal while maintaining isolation between the high-current circuit and the measurement apparatus, making this A 01297 unit suitable for applications requiring reliable current sensing in AC power circuits.