Fusible plug

(Steam Boiler)

a piece of easily fusible alloy, placed in one of the sheets and intended to melt and blow off the steam in case of low water.- Ure.

fusible plug

[¦fyü·zə·bəl ′pləg] (engineering) safety plug

A metal chain link made of a low-melting-point alloy; in case of fire, the chain breaks, thereby closing a damper, door, or the like.

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