Abstract: A protective fuse assembly for a current limiting fuse of the type, including a dielectric housing enclosing the fuse, an end cap secured to the lower end of the fuse by a pyrotechnic charge assembly, the end cap supporting the housing on the fuse, an end cap mounted on the upper end of the fuse for centering the housing on the fuse, and an electrically conductive wire connecting the charge to the fuse whereby the charge is detonated when the fuse senses a fault current to release the lower end cap from the fuse so that the housing drops to the bottom of the fuse.

Abstract: A current limiting oil immersible fuse including a tubular housing having a resilient elastomeric cap sealed to each end of the housing, an end cap independently mounted on each end of the housing and overlying the resilient elastomeric cap and a fuse assembly supported in the housing by the end caps.

Abstract: A low fault current interrupting fuse assembly for a full range current limiting fuse of the type having a high fault current interrupting fuse element connected in series with the low fault current interrupting fuse assembly, said assembly including a first fuse element having a high melt temperature characteristic and a second fuse element having a low melt temperature characteristic, the first and second fuse elements being connected in parallel and having different diameters to provide current interruption at different time-current characteristics under low fault current conditions.

Abstract: A fault sensing system for protecting a transformer, the system including a partial range current limiting fuse connected in series in the primary circuit for the network transformer, a normally open vacuum switch connected to the primary circuit and shunted to ground between the current limiting fuse and the transformer, a solenoid actuated assembly for closing the vacuum switch and a fault sensing circuit assembly operatively connected to energize the solenoid assembly, the fault sensing circuit being normally de-energized and including a current transformer mounted on the primary circuit and a low voltage fuse element connected across the current transformer, the fault sensing circuit assembly being energized on operation of the low voltage fuse element to momentarily energize the solenoid.