![]() Thus the PTC fuse symbol is, as already answered: The thermistor is not supposed to reach an end state of open circuit the fuse does. Hence the other answer has a comment pointing out the difference between a PTC thermistor and PTC fuse symbol. The lines at the end of the diagonal appear to be used to indicate achieving an end state. A line with an arrow across a resistor is the common way to show an adjustable resistor - typically mechanically adjustable. Putting a diagonal line across the resistor seems to be a common way to indicate a value change. My understanding is that using the rectangle or the zig-zag for a resistor depends on which side of the Atlantic you are on. In the first case the circuit stops operating in the second it does not. The difference between fusing and current limiting is big. I believe it is important for the schematic to show as much about the circuit functionality as possible. a thermistor resistance of the PTC device is measured to infer its temperature.įor example this is a PTC fuse datasheet Bel PTC Fuse datasheet, and this Murata POSISTOR datasheet is a datasheet for other types of PTCs. A current limiter increasing resistance is intended to limit current in the circuit but keep the circuit functional.An overload limiter similar to the fuse but does not go quite as high impedance when hot.A fuse heating causes the resistor to go open circuit.This is because there are a variety of PTC (positive temperature coefficient) resistor devices. This is actually a more difficult question than it would seem. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |