PTC Resettable Fuses, also known as Polymeric Positive Temperature Coefficient (PTC) devices or resettable circuit protectors, are essential components in electronic circuits designed to protect against overcurrent conditions. Unlike traditional fuses, PTC resettable fuses can automatically reset themselves after a fault condition is cleared, providing a self-healing feature that enhances the reliability of electronic systems. Types of PTC Resettable Fuses: Radial Leaded PTCs, Surface Mount PTCs, Battery Strap PTCs, Telecom PTCs, Automotive PTCs. Selecting the right PTC resettable fuse involves considering several factors to ensure optimal protection: Hold Current (Ihold), Trip Current (Itrip), Voltage Rating, Time-to-Trip, Temperature Rating. Understanding the types, key selection criteria, and application-specific considerations is essential for effectively implementing PTC resettable fuses in various electronic circuits.