Claims
- 1. A gas-evolving pulverulent arc-quenching filler composition, comprising:
- a pulverulent arc-quenching filler, a binder, and a gas-evolving material, wherein the gas-evolving material is bound by the binder to a surface of the pulverulent arc-quenching filler, said composition being formed as a free-flowing pulverulent.
- 2. The composition of claim 1, wherein the pulverulent arc-quenching filler is selected from the group consisting of silicas and silicates.
- 3. The composition of claim 1, wherein the pulverulent arc-quenching filler is selected from the group consisting of sand, mica and quartz.
- 4. The composition of claim 3, wherein the pulverulent arc-quenching filler is a granule, said composition being in the form of a free-flowing granule.
- 5. The composition of claim 3, wherein the pulverulent arc-quenching filler is a bead granule, said composition being in the form of a free-flowing bead.
- 6. The composition of claim 1, wherein the binder is selected from the group of resins consisting of acrylics, urethanes, epoxies, melamines, and polyesters.
- 7. The composition of claim 3, wherein the binder is an acrylic resin.
- 8. The composition of claim 7, wherein the gas-evolving material is selected from the group consisting of guanidine carbonate, hydantoin and urea phosphate.
- 9. The composition of claim 1, wherein the gas-evolving material is selected from the group consisting of melamine, cyanuric acid, melamine cyanurate, guanidine, guanidine carbonate, guanidine acetate, 1,3-diphenylguanidine, guanine, urea, urea phosphate, hydantoin and allantoin.
- 10. The composition of claim 1, wherein the gas-evolving material is bound to the surface of each of the primary particles of the arc-quenching filler.
- 11. The composition of claim 1, wherein loading of the gas-evolving material is up to about 20% by weight of the pulverulent arc-quenching filler.
- 12. A method of making a gas-evolving pulverulent arc-quenching filler composition, comprising:
- (a) providing a supply of pulverulent arc-quenching filler particles;
- (b) suspending the pulverulent arc-quenching filler particles in a binder in solution, to coat a surface of the pulverulent arc-quenching filler particles with a binder coating;
- (c) drying the pulverulent arc-quenching filler particles and the binder coating to tackiness;
- (d) applying a gas-evolving material to the arc-quenching filler particles and binder coating, to coat a surface of the pulverulent arc-quenching filler particles and the binder coating with the gas-evolving material; and,
- (e) drying the gas-evolving pulverulent arc-quenching filler particles, to form a composition of free-flowing particles.
- 13. The method of claim 12, wherein the pulverulent arc-quenching filler particles are selected from the group consisting of granular sand, mica or quartz.
- 14. The method of claim 12, wherein the gas-evolving material is selected from the group consisting of powdered melamine, cyanuric acid, melamine cyanurate, guanidine, guanidine carbonate, guanidine acetate, 1,3-diphenylguanidine, guanine, urea, urea phosphate, hydantoin and allantoin.
- 15. The method of claim 12, wherein the binder is selected from the group of resins consisting of acrylics, urethanes, epoxies, melamines, and polyesters.
- 16. A high voltage current limiting fuse, comprising:
- a generally tubular casing of electrically insulating material; a pair of terminal elements closing each of the opposite ends of said tubular casing; at least one fuse element conductively interconnecting said pair of terminal elements; a core for supporting said at least one fuse element longitudinally extending parallel to the longitudinal axis of said tubular casing; a plurality of gas-evolving pulverulent arc-quenching fillers inside said tubular casing in close proximity to the fuse element, wherein each gas-evolving pulverulent arc-quenching filler comprises a pulverulent arc-quenching filler, a binder, and a gas-evolving material, wherein the gas-evolving material is bound by the binder to surfaces of the pulverulent arc-quenching filler, said gas-evolving pulverulent arc-quenching fillers being in the form of a free-flowing pulverulent.
- 17. The composition of claim 1, wherein the composition is filled in the casing around a high voltage current limiting fuse.
- 18. The composition of claim 8, wherein the composition is filled in the casing around a high voltage current limiting fuse.
- 19. The method of claim 15, wherein the binder is dissolved in a liquid carrier selected from the group consisting of toluene, xylene, methyl ethyl ketone, and methyl isobutyl ketone.
- 20. The fuse of claim 16, wherein the gas-evolving pulverulent arc-quenching fillers inside the tubular casing further comprise a pulverulent arc-quenching filler selected from the group consisting of sand, mica end quartz, a binder selected form the group consisting of acrylic, urethane, epoxy, melamire and polyester resins, and a gas-evolving material selected from the group consisting of melamine, cyanuric acid, melamine cyanurate, guanidine, guanidine carbonate, guanidine acetate, 1,3-diphenylguanidine, guanine, urea, urea phosphate, hydantoin and allantoin.
- 21. The fuse of claim 16, wherein the gas-evolving pulverulent arc-quenching fillers in the tubular casing further comprises a pulverulent arc-quenching filler comprising sand, a binder comprising acrylic resin, and a gas-evolving material selected from the group consisting of guanidine carbonate, urea phosphate, and hydantoin.
- 22. The fuse of claim 21, wherein the loading of the gas-evolving material is from about 2 to 70% by weight of the pulverulent arc-quenching filler.
- 23. The fuse of claim 21, wherein the loading of the gas-evolving material is up to about 20% by weight of the pulverulent arc-quenching filler.
- 24. The fuse of claim 20, wherein the pulverulent arc-quenching filler is a granule, said gas-evolving pulverulent arc-quenching fillers being in the form of free-flowing granules.
- 25. The fuse of claim 20, wherein the pulverulent arc-quenching filler is a bead granule, said gas-evolving pulverulent arc-quenching fillers being in the form of free-flowing beads.
- 26. The fuse of claim 16, wherein the gas-evolving pulverulent arc-quenching fillers occupy all of the unoccupied spaces inside the tubular casing.
Parent Case Info
This application is a continuation of application Ser. No. 08/165,201, filed Dec. 13, 1993 now abandoned.
US Referenced Citations (21)
Foreign Referenced Citations (2)
Number |
Date |
Country |
2112283 |
Mar 1971 |
DEX |
3039987 |
Oct 1980 |
DEX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
165201 |
Dec 1993 |
|