Fusible link

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A fusible link is a device consisting of two strips of metal soldered together with a fusible alloy that is designed to melt at a specific temperature, thus allowing the two pieces to separate.

Fusible links are utilized as the triggering device in fire sprinkler systems and mechanical automatic door release mechanisms that closes fire doors in warehouses, etc. Some high-security safes also utilize fusible link-based relockers as a defense against torches and heat-producing tools.

Fusible links come in a variety of designs and different temperature ratings.

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