current transformer 7a412 3 1000 5aProduct Description The 7A412. 3 1000 5A is a high capacity current transformer engineered for accurate current measurement and protection in large scale electrical installations. With a primary current rating of 1000 A and a standard 5 A secondary output, this CT is ideal for heavy industrial systems, substations, and power distribution networks. Designed to operate reliably under high load conditions, it offers excellent electrical performance,