Thursday, June 19, 2008

Polyfuse

ABSTRACT

A Fuse is a one-time over-current protection device employing a fusible link that melts after the current exceeds a certain level for a certain length of time. Typically, a wire or chemical compound breaks the circuit when the current exceeds the rated value.

Polyfuse is a resettable fuse that doesn’t need to be replaced like the conventional fuse. Resettable fuses provide over-current protection and automatic restoration. Fuses work between life and death of a circuitry. Choosing the right fuse is important for prolonged protection of the circuitry from over-current and voltage spikes. Conventional fuse is either ‘ok’ or ‘blown,’ but polyfuse is a resettable fuse by itself.

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