Ptc Resettable Fuse

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Ptc resettable fuse.

A resettable fuse also known as a ptc is a resistor that has very unique properties. Choosing between a ptc and a fuse overcurrent circuit protection can be accomplished with the use of either a traditional fuse or the more recently developed resettable ptc. Bourns multifuse polymer positive temperature coefficient pptc resettable fuses are overcurrent protection devices used in a wide variety of circuit protection applications. Surface mount resettable ptc devices provide overcurrent protection for applications where space is at a premium and resettable protection is desired.

Circuit protection ship same day. A resettable fuse or polymeric positive temperature coefficient device pptc is a passive electronic component used to protect against overcurrent faults in electronic circuits the device is also known as a multifuse or polyfuse or polyswitch they are similar in function to ptc thermistors in certain situations but operate on mechanical changes instead of charge carrier effects in semiconductors. Package size varies from 0402 to 3425 while hold current ranges from 50ma to 7 0a. A positive temperature coefficient ptc resettable fuse protects electronic devices in the event that excessive current or heat is generated.

The ptc fuse responds with a physical change that inhibits excess current from traveling through the circuit. The devices generally increase the level of resistance at a specific threshold. For this model if your circuit tries to draw more than 250ma of current if you have a bad short for instance the ptc would trip by heating up. 5160 rivergrade road baldwin park ca 91706 1406 u s a.

Under fault conditions a polymer ptc s resistance will rise exponentially and remain in a tripped state providing continuous overcurrent protection until the fault is removed. Current ratings of up to a few tens of amperes and voltage ratings of up to few tens of volts are feasible. Circuit protection ptc resettable fuses are in stock at digikey. The ceramic ptc thermistor has similar behavior but the resistance variation is not as fast.