Abstract: Two housing halves are joined to form a housing surrounding an electrical fuse, a sealing gasket being provided at the joint between the housing halves. A corona shield is embedded wholly within each housing half, each shield terminating on its respective side of the gasket so that the ends thereof are closely adjacent but yet spaced apart with a portion of the gasket therebetween. Each shield is electrically connected to a respective end of the fuse. The gasket has an inner cylindrical wall provided with spaced ribs. The cylindrical wall closely engages the fuse within the housing and small elongated openings are defined along both sides of each rib. A vent assembly in one of the housing halves selectively opens and closes the housing interior to the ambient dependent upon the internal housing pressure.