Abstract: A device and method for checking differential switches in low voltage systems, includes a device which is connected to the mains at the point in the current that is to be checked. The device has bridges which are automatically or manually activated. The checking is done by pulsation of connections. Selecting one or more pushbuttons together enables the status of the differentials associated with that point of current to be detected. The device has means for automatically identifying the phase and branching this off to ground, with no need to know where the phase is prior to verification. The method includes the step of branching predetermined current values from phase to ground.