The CRJ-31 Adapter provides 3 inputs for the Split Core CTs with a Phase Sequence Mark. It converts this into a RJ12 connection. A RJ12 Patch Cable connects the CRJ-31 with the Multi-Channel-Meter SDM630MCT-4L. Up to 12 single phase channels can be monitored. This requires 4 x CRJ-31 with 4 x RJ12 Patch Cables and 12 Split-Core CTs.