Solid core current transformers do not open and shut like a split core transformer, so a conductor must be disconnected in order to pass through the opening, making them more suited for new installations. Applications include power grid monitoring and measuring current in a circuit.

Split core current transformers can be opened and then shut around a high-amperage wire so the wire does not need to be disconnected, making them ideal for installing into existing installations. Applications include power grid monitoring and measuring current in a circuit.