current transformer (CT)

A device for measuring electrical currents.

Metering style CTs are designed with smaller cores and VA capacities. This causes metering CTs to saturate at lower secondary voltages saving sensitive connected metering devices from damaging large fault currents in the event of a primary electrical fault.

CT meters are used for service points that require electrical current of more than 100 amps. This type of meter takes a sample of the current to determine consumption. Currents of greater than 100 amps are not generally directed through a meter, due to the risk of current overload.