Monitoring arrangement of an elevator, comprising: a drop-out safety device (1, 2, 3) of the elevator; an elevator component (4, 5, 6), which is in operational connection with the drop-out safety device of the elevator; a measuring device (7, 22), with which the operation of the aforementioned elevator component (4, 5, 6) is measured; wherein the monitoring arrangement comprises a monitoring unit, which comprises an input for the measuring data of the aforementioned measuring device (7, 22) and which monitoring unit comprises a memory for setting one or more boundary conditions to be connected to the safe operation of the elevator component, and wherein the monitoring unit is configured - to receive measuring data from the aforementioned measuring device (7, 22) and also - to form a monitoring signal for preventing a dangerous situation of the elevator if the measuring data received does not fulfill the boundary conditions set for the safe operation of the elevator component, wherein the aforementioned safety device is an electromagnetic brake (1, 2), wherein the aforementioned elevator component is a brake control circuit (5, 6) configured for supplying current to the magnetizing coil of the electromagnetic brake of the elevator, characterized in that the aforementioned brake control circuit (5, 6) is configured for connection between a current source and the electromagnetic brake (1, 2) of the elevator; and is in that the monitoring arrangement comprises: measuring means for measuring the earth fault current of the brake control circuit (5, 6); a limit value for the earth fault current of the brake control circuit (5, 6); and wherein the monitoring unit is further configured: - to compare the measuring data of the earth fault current being received from the aforementioned measuring means to the aforementioned limit value for earth fault current of the brake control circuit (5, 6), and also - to determine that the operating safety of the drop-out safety device (1, 2, 3) of the elevator is endangered, if the magnitude of the measured earth fault current exceeds the limit value for earth fault current. a drop-out safety device (1, 2, 3) of the elevator; an elevator component (4, 5, 6), which is in operational connection with the drop-out safety device of the elevator; a measuring device (7, 22), with which the operation of the aforementioned elevator component (4, 5, 6) is measured; wherein the monitoring arrangement comprises a monitoring unit, which comprises an input for the measuring data of the aforementioned measuring device (7, 22) and which monitoring unit comprises a memory for setting one or more boundary conditions to be connected to the safe operation of the elevator component, and wherein the monitoring unit is configured - to receive measuring data from the aforementioned measuring device (7, 22) and also - to form a monitoring signal for preventing a dangerous situation of the elevator if the measuring data received does not fulfill the boundary conditions set for the safe operation of the elevator component, - to receive measuring data from the aforementioned measuring device (7, 22) and also - to form a monitoring signal for preventing a dangerous situation of the elevator if the measuring data received does not fulfill the boundary conditions set for the safe operation of the elevator component, wherein the aforementioned safety device is an electromagnetic brake (1, 2), wherein the aforementioned elevator component is a brake control circuit (5, 6) configured for supplying current to the magnetizing coil of the electromagnetic brake of the elevator, characterized in that the aforementioned brake control circuit (5, 6) is configured for connection between a current source and the electromagnetic brake (1, 2) of the elevator; and is in that the monitoring arrangement comprises: measuring means for measuring the earth fault current of the brake control circuit (5, 6); a limit value for the earth fault current of the brake control circuit (5, 6); and wherein the monitoring unit is further configured: - to compare the measuring data of the earth fault current being received from the aforementioned measuring means to the aforementioned limit value for earth fault current of the brake control circuit (5, 6), and also - to determine that the operating safety of the drop-out safety device (1, 2, 3) of the elevator is endangered, if the magnitude of the measured earth fault current exceeds the limit value for earth fault current. measuring means for measuring the earth fault current of the brake control circuit (5, 6); a limit value for the earth fault current of the brake control circuit (5, 6); and wherein the monitoring unit is further configured: - to compare the measuring data of the earth fault current being received from the aforementioned measuring means to the aforementioned limit value for earth fault current of the brake control circuit (5, 6), and also - to determine that the operating safety of the drop-out safety device (1, 2, 3) of the elevator is endangered, if the magnitude of the measured earth fault current exceeds the limit value for earth fault current. - to compare the measuring data of the earth fault current being received from the aforementioned measuring means to the aforementioned limit value for earth fault current of the brake control circuit (5, 6), and also - to determine that the operating safety of the drop-out safety device (1, 2, 3) of the elevator is endangered, if the magnitude of the measured earth fault current exceeds the limit value for earth fault current.