Current sensors

A current sensor is a device that detects electric current in a wire and generates a signal proportional to that current. ... The generated signal can be then used to display the measured current in an ammeter, or can be stored for further analysis in a data acquisition system, or can be used for the purpose of control.

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Current sensors are electrical components that can be used to measure the current in cables and busbars, usually in a galvanically isolated (non-contact) manner, based on the magnetic flux density triggered by electrical currents.