How many CTs are needed for 3-phase 3-wire, and other phase formats?

For each power monitor, normally you use 1 to 3 CTs.
Single phase 2-wire = 1 CT; single-phase three-wire = 2 CTs; three-phase three-wire = 2 CTs, and three-phase four-wire = 3 CTs.

PR201 Power Monitors

The PR201 Power Monitors was discontinued on 1/01/2006. The PR300 is a replacement product.
Power monitoring package SMARTDAC+ GM / UPM100

Power monitoring package SMARTDAC+ GM/UPM100 is a data collection system for energy saving monitoring consisting of 920 MHz compatible power monitor UPM 100 and data acquisition system GM. Easily visualize the electric power used in the factory (graph) and create reports, etc. We can help waste energy by finding waste of electricity used.
UPM01

Model Name: UPM01
UPM02

Model Name: UPM02
UPM03

Model Name: UPM03
UPM100/UPM101

UPM100 / UPM101 is a compact power monitor that can measure 15 items such as electricity energy with 1 unit.
UZ002

Model Name: UZ002
UZ003

Model Name: UZ003
UZ005 Power Monitors

The UZ005 Power Monitors was discontinued on 9/01/2006. The PR300 is a replacement product.
UZ008

Model Name: UZ008