| 摘要 |
PCT No. PCT/US88/02824 Sec. 371 Date Jul. 7, 1989 Sec. 102(e) Date Jul. 7, 1989 PCT Filed Aug. 17, 1988 PCT Pub. No. WO89/01697 PCT Pub. Date Feb. 23, 1989.Improved arc-suppressing fuse tubes of the type used in electrical cutouts is provided which includes a fluid epoxy resin matrix core designed, upon experiencing high temperature arcing conditions, to generate sufficient moisture and arc-suppressing gases to safely and efficiently interrupt an arc. The fuse tubes of the invention completely eliminate the use of expensive and difficult to fabricate bone fiber conventionally used in fuse tubes of this type. The preferred fuse tube construction is an integrated, synthetic resin body having an outer tubular shell including an epoxy fiberglass-reinforced synthetic resin matrix, together with an inner tubular arc-suppressing core having an epoxy resin matrix with respective quantities of an organic fiber and an inorganic filler therein. An anhydride curing agent for the epoxy is incorporated at an anhydride to epoxide ratio from about 1.0 to 1.4:1. The filler, aluminum trihydrate, make up 40% to 80% by weight of the inner core and is operable to generate copious amounts of molecular water under arcing conditions. The organic fiber, present in an amount of from 5% to 30% by volume of the core, is either polyester or polyester plus rayon and provides a degree of structural reinforcement for the core during manufacturing. The fiber also aids in arc-suppression through the evolution of gaseous products. The fuse tubes of the invention may be pultruded as integrated, joint-free bodies of any convenient length.
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