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.