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How do I reset my PTC fuse?
The general procedure for resetting the device after an overload has occurred is to remove power and allow the device to cool down. When a PPTC is in a “tripped state” it protects the circuitry by limiting the current flow to a low leakage level.
What does PTC stand for in fuses?
The Fuses work by increasing its resistance as its temperature rises due to the current increase. The trip current ranges from 14 mA to 50 A with the Time to trip ranging from 8 ms to 90 s. PTC = Positive Temperature Coefficient.
How does a multi fuse work?
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.
What can a PTC fuse be used for?
The PTC fuse responds with a physical change that inhibits excess current from traveling through the circuit. The type of response depends on whether the device is a ceramic fuse or a polymeric fuse. PTC fuses can be used in automotive, consumer electronic, or industrial applications.
What happens to a PTC when power is shut off?
When the power is shut off thedevice cools down and returns to its low-resistance state. Like a fuse, a PTC is rated for the maximumshort-circuit current (I max ) itcan interrupt at rated voltage.
How long does it take for a tripped fuse to cool?
This cooling usually takes a few seconds, though a tripped device will retain a slightly higher resistance for hours, unless the power in it is weaker, or has been often used, slowly approaching the initial resistance value.
What are the principles of operation for a fuse?
The principles of operation for a fuse have been documented over the years and are generally well understood. The actual process by which the PTC provides overcurrent circuit protection is less clear and merits further discussion. So far the PTC has been identified as being polymer based, current limiting, and resettable.