The CR Magnetics CR4120S-300 split-core current transformer is a clamp-on device that measures AC current by encircling a conductor within its split core. It is listed as CR4120S-300, with CR4120S400 appearing in related listings, indicating variant compatibility within the CR4120S series. The transformer provides electrical isolation between the primary circuit and sensing electronics and is designed for easy installation in electrical panels or instrumentation setups that require non-disruptive current measurement.
