A program switch for a circuit, the program switch defined by a fuse assembly, the fuse assembly comprising: a substrate, wherein the substrate comprises a semiconductor; an insulating layer disposed on the substrate, the insulating layer comprising silicon dioxide, the thickness of the insulating layer is between 0.14 μm and 1.4 μm; a conductor disposed on the insulating layer as a top layer of the program switch, the conductor comprising aluminum and having a low melting temperature, and the conductor comprising: an inlet terminal; an outlet terminal; and a fuse element between the inlet terminal and the outlet terminal, the inlet terminal and the outlet terminal widthwise narrowing toward the fuse element, characterised by the fuse element having a first thickness and a first width, the first width being between 1 and 5 times the first thickness, wherein the conductor forms an hourglass shape, defined by: transitions between the fuse element and the inlet terminal and the outlet terminal including rounded fillets; opposing ends of the fuse element defining a first length that is between 1 and 3 times the first width; and a length between opposing ends of the inlet terminal and the outlet terminal being 2 times the first length; and the inlet terminal and the outlet terminal having a same maximum width that is 10 times the first width, wherein interfacial tension and wettability characteristics of the silicon dioxide insulating layer enable the aluminum conductor to stick to the insulating layer prior to melting, to form stable beads on the insulating layer upon melting, and remain as stable beads during subsequent hardening, thereby preventing healing of the fuse assembly after being blown and current from passing between the fuse terminals after melting. a substrate, wherein the substrate comprises a semiconductor; an insulating layer disposed on the substrate, the insulating layer comprising silicon dioxide, the thickness of the insulating layer is between 0.14 μm and 1.4 μm; a conductor disposed on the insulating layer as a top layer of the program switch, the conductor comprising aluminum and having a low melting temperature, and the conductor comprising: an inlet terminal; an outlet terminal; and a fuse element between the inlet terminal and the outlet terminal, the inlet terminal and the outlet terminal widthwise narrowing toward the fuse element, characterised by the fuse element having a first thickness and a first width, the first width being between 1 and 5 times the first thickness, wherein the conductor forms an hourglass shape, defined by: transitions between the fuse element and the inlet terminal and the outlet terminal including rounded fillets; opposing ends of the fuse element defining a first length that is between 1 and 3 times the first width; and a length between opposing ends of the inlet terminal and the outlet terminal being 2 times the first length; and the inlet terminal and the outlet terminal having a same maximum width that is 10 times the first width, wherein interfacial tension and wettability characteristics of the silicon dioxide insulating layer enable the aluminum conductor to stick to the insulating layer prior to melting, to form stable beads on the insulating layer upon melting, and remain as stable beads during subsequent hardening, thereby preventing healing of the fuse assembly after being blown and current from passing between the fuse terminals after melting. an inlet terminal; an outlet terminal; and a fuse element between the inlet terminal and the outlet terminal, the inlet terminal and the outlet terminal widthwise narrowing toward the fuse element, characterised by the fuse element having a first thickness and a first width, the first width being between 1 and 5 times the first thickness, wherein the conductor forms an hourglass shape, defined by: transitions between the fuse element and the inlet terminal and the outlet terminal including rounded fillets; opposing ends of the fuse element defining a first length that is between 1 and 3 times the first width; and a length between opposing ends of the inlet terminal and the outlet terminal being 2 times the first length; and the inlet terminal and the outlet terminal having a same maximum width that is 10 times the first width, wherein interfacial tension and wettability characteristics of the silicon dioxide insulating layer enable the aluminum conductor to stick to the insulating layer prior to melting, to form stable beads on the insulating layer upon melting, and remain as stable beads during subsequent hardening, thereby preventing healing of the fuse assembly after being blown and current from passing between the fuse terminals after melting. transitions between the fuse element and the inlet terminal and the outlet terminal including rounded fillets; opposing ends of the fuse element defining a first length that is between 1 and 3 times the first width; and a length between opposing ends of the inlet terminal and the outlet terminal being 2 times the first length; and the inlet terminal and the outlet terminal having a same maximum width that is 10 times the first width, wherein interfacial tension and wettability characteristics of the silicon dioxide insulating layer enable the aluminum conductor to stick to the insulating layer prior to melting, to form stable beads on the insulating layer upon melting, and remain as stable beads during subsequent hardening, thereby preventing healing of the fuse assembly after being blown and current from passing between the fuse terminals after melting.