Abstract: A power supply disconnect device includes a main housing that fits within a power supply distribution panel; a receptacle in the main housing; a detachable fuse holder that fits within the main housing receptacle; first electrical contacts within the main housing that are engagable with a fuse in the fuse holder when the fuse holder is inserted in the main housing receptacle; the fuse holder includes two parts that are moveable relative to each other, and which can be moved into an open position for receiving the fuse and into a closed position for securing the fuse in the fuse holder; and an alarm fuse connected to the first electrical contacts so as to provide an alarm in the event that a fuse in the fuse holder is blown, the alarm fuse being located in the receptacle in the main housing.