3-IN-1 Current Sensor is one of the solid core Current Sensors, also named as current transformer, transducers, A range of 3-in-1 Current Sensors combine three traditional Current Sensors in one molded case. 3-in-1 Current Sensors can be directly installed next to a three-phase CT type energy meters, Saving not only installation time, installation costs, but also installation space where three standard individual Current Sensors fitted.