This type of current transformer is available to measure AC currents from 100A to 600A, at 50 to 400HZ.  They are very popular in sub-metering applications where existing systems are being upgraded and it is impractical to isolate the primary conductor.  It is even possible to install this type of transformer while the conductor is energized, however it is paramount that certain safety precautions be followed under such conditions.

Rectangular in shape, standard split-core models are available with window dimensions up to 4.00" X 7.50".  Even larger, custom designed sizes are available by special order.

Secondary ratings of 5A, 1A, and 100ma are all common in split-core current transformers.

Two model groups are available, SP and SPS.  The former is provided with a stainless steel screw-clamp band securing the two core halves, the latter has a UV resistant nylon band.  All ratios are available in either type.  Electrical and magnetic performance is identical for the two groups.