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This is a handy little device that can save your system from smoking. A resettable fuse (also known as a PTC) is a resistor that has very unique properties.
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). The increased resistance (trip state) would break the circuit and allow only a small leakage current.
The leakage current may still be enough to hurt some electronics but it s much less than the 3A that the short may have allowed. Removing the short, the PTC resets and allows current up to 250mA to flow again. It s a resettable fuse that protects your system! Good for use on battery powered devices that need to protect again high-current accidental discharges.
The thermal pictures to the right do a great job of showing what happens when the PTC is tripped. The first thermal picture shows a voltage regulating circuit in its normal state. In the second picture the circuit is shorted, notice how hot the PTC gets (213 °F!) as it limits the amount of damaging current going through the circuit. Major thanks to Joshua Weaver for the great thermal shots!
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Informazioni aziendali
ROBOT DOMESTICI SRL - Via Cornelio Labeone, 70 - 00174 Roma (RM)
Partita IVA IT15791431008 - REA di Roma n. RM 1614298
CODICE FATTURAZIONE ELETTRONICA: KRRH6B9
Tel. (+39) 06 76971136 | e-mail: info@robot-domestici.it