Fuses and Fusible Cut-Outs

The paper briefly reviews the history of the development of fusible cut-outs, and proceeds to discuss in turn the various factors affecting the design and behaviour of wire and plate fuses in air. The main features of fuse wires in oil are considered and also how their design and behaviour compare with those of fuses in air. Various types of enclosed and semi-enclosed cut-outs are described, as well as oil-immersed switch-fuses. The theoretical aspect of the mechanism of fusing is summarized in Appendix 1, and the present position as to standardization in Appendix 2.