S-042KU is a waterproof split-core current transformer that is suitable for the detection of AC leakage current, current, higher harmonics, phase, electric energy, power and power factor, etc. S-042KU is designed with multiple interlocking and overlapping magnetic cores, double shielded, split-core, and it uses the non-contact method to conduct measurements, it does not require disconnecting any wires. It provides an efficient and reliable solution for monitoring circuits.