Patent ID: 8390966

Claim:
A power switch disposed in a housing, the power switch comprising: a contact breaker configured to connect and disconnect a low-voltage switchgear from a power source supplying the low-voltage switchgear; a triggering device configured to disconnect the low-voltage switchgear in an overload event; a current detection device configured to detect at least one conductor current supplying the low-voltage switchgear; a short-circuiting device configured to short-circuit a path of the at least one conductor currents; and a control device configured to process the detected at least one conductor current and to generate at least one triggering signal to the triggering device, the control device including a first evaluation device and a second evaluation device configured to evaluate an accidental arc overcurrent; wherein the power switch is configured to be activated via an overcurrent signal generated by an arc monitoring system in response to the accidental arc overcurrent, the overcurrent signal being linked to the at least one triggering signal via the first evaluation device and the triggering device; wherein the second evaluation device has a threshold above a threshold of the first evaluation device, the triggering device being configured to be activated via a turn-off pulse when a signal from the current detection device is above the threshold of the second evaluation device; and wherein the second evaluation device is associated with the short-circuiting device, the short-circuiting device being configured to be activated when the signal from the current detection device is above the threshold of the second evaluation device.