Arc fault detection device for detecting a predefined fault current, - comprising a housing , - comprising an indicator apparatus with a tripping device which has a tripping coil and also a tripping tappet which is mounted such that it can move relative to the said tripping coil and can be shifted from a ready-to-trip position to a tripped position by applying current to the tripping coil , comprising an indicator element which, when the tripping device is tripped, can be moved from a first position to a second position, which indicator apparatus is received and held in the housing , - comprising a coupling element which, in a manner formed in a side wall of the housing , is provided for coupling the arc fault detection device to a further circuit breaker, - wherein the coupling element is coupled to the tripping tappet of the indicator apparatus in such a way that, in the event of a movement of the tripping tappet to its tripped position, a tripping signal can be transmitted by means of the coupling element to the further circuit breaker which is coupled to the arc fault detection device , wherein the indicator element is held in its first position by the tripping tappet which is in the ready-to-trip position and can be released by shifting the tripping tappet to its tripped position, wherein the tripping tappet is blocked from returning to its ready-to-trip position from its tripped position by the indicator element in its second position, - wherein the indicator element can be moved to a third position, as a result of which the arc fault detection device can be reset to a ready-to-trip state, - wherein the first position is situated between the second position and the third position, and - wherein the arc fault detection device has a microbutton which can be operated by a movement of the indicator element to its third position, as a result of which the arc fault detection device is reset to a ready-to-trip state. - comprising a housing , - comprising an indicator apparatus with a tripping device which has a tripping coil and also a tripping tappet which is mounted such that it can move relative to the said tripping coil and can be shifted from a ready-to-trip position to a tripped position by applying current to the tripping coil , comprising an indicator element which, when the tripping device is tripped, can be moved from a first position to a second position, which indicator apparatus is received and held in the housing , - comprising a coupling element which, in a manner formed in a side wall of the housing , is provided for coupling the arc fault detection device to a further circuit breaker, - wherein the coupling element is coupled to the tripping tappet of the indicator apparatus in such a way that, in the event of a movement of the tripping tappet to its tripped position, a tripping signal can be transmitted by means of the coupling element to the further circuit breaker which is coupled to the arc fault detection device , wherein the indicator element is held in its first position by the tripping tappet which is in the ready-to-trip position and can be released by shifting the tripping tappet to its tripped position, wherein the tripping tappet is blocked from returning to its ready-to-trip position from its tripped position by the indicator element in its second position, - wherein the indicator element can be moved to a third position, as a result of which the arc fault detection device can be reset to a ready-to-trip state, - wherein the first position is situated between the second position and the third position, and - wherein the arc fault detection device has a microbutton which can be operated by a movement of the indicator element to its third position, as a result of which the arc fault detection device is reset to a ready-to-trip state. <EOS>