Solderless Surface Mount Fuse Design

The patent extracts the harmful element (solder) from the internal structure of the fuse by using end caps with through-holes that allow the fuse element to pass through and be secured mechanically without soldering. The solder is completely removed from the internal fuse construction, eliminating the need for internal soldering operations while maintaining secure attachment through alternative means such as deformation of the fuse element or mechanical retention features in the end caps.

The patent replaces the thermal-chemical joining process (soldering) with a mechanical retention system. The end caps are designed with through-holes that mechanically retain the fuse element through friction, deformation, or interlocking features, substituting the need for thermal-chemical bonding with a purely mechanical attachment system that is simpler and more reliable.

The patent extracts the solder material from the electrical current path by designing end caps with through-holes that allow the fuse element to pass through directly. This eliminates the solder joints that would otherwise be in series with the fuse element, removing the additional electrical resistance and heat generation associated with solder connections from the current path.

The patent applies different properties to different parts of the end cap structure. The regions where the fuse element contacts the end cap are designed with high electrical conductivity and low contact resistance, while other regions can be made of materials optimized for mechanical retention. This local optimization ensures minimal electrical resistance at the critical contact points while maintaining secure attachment.

The patent extracts the solder and organic flux materials from the internal fuse structure, completely clearing the path for the electrical arc. The through-hole design in the end caps removes all obstructive materials that would otherwise limit arc channel length, allowing the arc to extend the full available distance between end caps and significantly improving short circuit interrupting capability.

The patent segments the end cap structure into regions that separate the mechanical retention function from the electrical arc path. The through-holes create distinct zones: one for mechanical retention of the fuse element and another for the unobstructed arc channel. This segmentation allows the arc to develop fully without being constrained by solder joints or flux residues, enhancing the fuse's ability to interrupt short circuits.