Littelfuse POLY-FUSE Resettable PTCs - 2920L SeriesThe Littelfuse 2920L series PTC provides surface mount overcurrent protection for applications where space is at a premium and resettable protection is desired.Surface Mount TechnologyResettable fuses are designed for the protection of electrical and electronic circuits against excessive currents. They switch rapidly from a low resistance to very high resistance state under electrical overload or short circuit conditions, and feature automatic reset and return to low resistance state when fault condition ceases and power is removed.Maintenance free automatic reset for thousands of cyclesSmall size and no fuseholder requiredMain applicationsSecurity systemsPower supplies and transformersPower switching devicesAutomotive and medical equipmentInstrumentation and controlComputers and peripheralsAudio visual and telecommunications