| 摘要 |
A striker pin device for providing a visual indication of an operated condition of an associated fuse, comprising a tubular housing coaxially arranged within the fuse with an end of the housing in contact with an end of the fuse. The tubular housing has a closure structure comprised of a one-piece integrally formed closure member having a projection protruding out of the housing and an opened end with a cavity. A piston with a central projection received in the opened end of the closure member forms a gas tight enclosure containing pyrotechnic material. An ignition element is attached to a brass pin which extends through the projection of the closure member and is connected to a tubular terminal or electrical conductor member which is attached to a high resistance pilot wire, which is stretched through the fuse. The ignition element extends through the pyrotechnic material, between the contacting surfaces of the closure member and the piston, and between the contacting surfaces of the piston and tubular housing for electrical connection between the ignition element and the housing. Ignition of the pyrotechnic material drives the piston and striker pin toward the opposite end of the housing to cause the striker pin to pierce the fuse cap thereby providing the visual indication of the operated condition of the fuse, the pyrotechnical material being ignited upon rupture of the low resistance fusible elements by the resulting flow of the shunt current through the electrically connected elements of the striker pin device.
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