Current
Industrial Current Transformers for Monitoring, Protection and Control
Current transformers (CTs) are instrument transformers used to measure AC current safely in power and automation systems. They scale high primary currents down to a small, standard secondary value that meters, relays and monitoring devices can handle without exposing them to line voltage.
By placing a conductor through the CT's primary window or connecting it in series, the current flowing in the main circuit is reproduced proportionally in the secondary winding. This allows operators and control equipment to monitor feeder loads, motor currents and panel circuits for overload, imbalance or energy usage while keeping the measurement circuit electrically isolated from the power circuit.
Current transformers are available in solid-core and split-core designs for new installations or retrofits, and in ratings suitable for branch circuits up through large distribution feeders. They work alongside sensors monitoring temperature, pressure and flow to give a complete picture of system performance and are commonly paired with power meters, protective relays and current-sensing inputs on automation controllers to provide accurate, repeatable current feedback.