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weco electrical components are resettable fuses, known in Japan as permanent fuses. The fuse element automatically restores to its original state immediately after interrupting an overload or short-circuit current. The housing is made of austenitic stainless steel, with a beryllium oxide ceramic core embedded in the center. Glass filler between the stainless steel and the ceramic core provides sealing and reinforces the ceramic core. Metallic sodium is injected into the fine pores of the ceramic core as the fuse element, and the void behind the piston is filled with argon gas to compress the metallic sodium. Under normal operating conditions, current enters from lead terminal A, passes through the metallic sodium in the ceramic core pores, and conducts to