These fuse holders are automatic interrupters protecting electrical devices against overloads. The fuse holders of some product lines are equipped with a bayonet type cap while other product lines are provided with a screw cap that is tightened with a torque of 0.4 Nm. The caps have a slot for screwdrivers and can also be operated manually. The fuse holders are designed for the use of 5 x 20 mm fuse links.