Arc-quenching compositions for high voltage current limiting fuses and circuit interrupters

摘要

The invention is directed to an arc-quenching coating compositions having effective arc-quenching properties and improved track resistance properties that are relatively easy to apply and operationally positioned in high voltage current limiting fuses or expulsion fuses, circuit breakers, circuit interrupters, separable cable connectors, or the like. The arc-quenching coating composition comprises an arc-quenching material (A) and a film-forming polymer (B) having minimal tracking properties, wherein the film-forming polymer (B) acts as a liquid vehicle for the coating composition. The arc-quenching material (A) is preferably selected from the group of guanidine, guanidine carbonate, guanidine acetate, 1,3-diphenylguanidine, guanine, melamine, melamine cyanurate, urea, hydantoin, allantoin and derivatives and mixtures thereof. The film-forming polymer (B) is preferably selected from the group of urethane, acrylic, melamine-formaldehyde and derivatives and mixtures thereof.;The invention is also directed to an arc-quenching composition having effective arc-extinguishing properties, and improved non-tracking properties and thermal stability selected from the group of guanidine carbonate, guanidine acetate, 1,3-diphenyl-guanidine, guanine, melamine cyanurate, urea, hydantoin and allantoin.