A resettable fuse (PTC) is a polymer-based positive temperature coefficient device that provides overcurrent protection by increasing resistance when heated, automatically resetting after fault clearance.
A Resettable Fuse, also known as a Polymeric Positive Temperature Coefficient (PPTC) device, is a passive electronic component used for overcurrent protection in electrical circuits. It consists of a conductive polymer composite with embedded conductive particles. Under normal operating conditions, it maintains low resistance. When excessive current flows, Joule heating causes the polymer to expand, separating conductive particles and dramatically increasing resistance (typically by 3-6 orders of magnitude), thereby limiting current flow. After the fault is removed and the device cools, it returns to its low-resistance state, making it reusable without replacement.
诱因 → 失效模式 → 工程缓解
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Traditional fuses operate by melting a metal element permanently, requiring replacement after tripping. PTC fuses use polymer expansion to increase resistance temporarily, automatically resetting when power is removed and the device cools, eliminating replacement needs.
Tripping occurs when current exceeds the hold rating, generating sufficient heat through I²R heating to expand the polymer matrix. Common causes include short circuits, overload conditions, or inrush currents exceeding device specifications.
Reset time varies from seconds to minutes depending on device size, ambient temperature, and mounting conditions. Complete cooling to ambient temperature is required for full reset to low-resistance state.
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