The abbreviation of the resettable fuse is PPTC. In principle, PPTC is the Chinese name of PPTC. It should be PTC, and PTC is divided into polymer and ceramic! Polymer abbreviation is PPTC, the ceramic abbreviation is CPTC, but the circuit diagram symbols are as follows: green with a slash! Only one R letter is used to replace the PCB board!
Method / step
1. Make sure that the Resettable fuse can not affect the normal operation of the product circuit
2. First of all, make sure that the Resettable fuse can not affect the normal operation of the product circuit
3. Determine the average working current (I) and maximum working voltage (V) on the equipment line.
4. Calculate the normal current IH according to the reduction rate of ambient temperature and current value.
IH = average working current (I) × reduction rate of ambient temperature and current value.
5. According to L, V value, product category, application space, and installation method, select a Resettable fuse series.
6. The maximum working voltage and fault current of the selected Resettable fuse are greater than or equal to the maximum working voltage and maximum fault current of the circuit.
7. Determine the action time, which is the time to switch the fuse to a high resistance state when the fault current appears on the whole device. If the selected component acts too fast, it will enter the protection state ahead of time, which will affect the normal operation of the circuit. If the element moves too slowly, the protected component may be damaged before the element is switched to a high resistance state.
8. Verify the ambient operating temperature to ensure that the minimum and maximum ambient temperature for the application is within
9. When using, pay attention to its certain resistance. The higher the rated current, the smaller the resistance; the higher the voltage type's resistance.
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Of ASTM onetime fuse and DTE PPTC SMD resettable fuse, providing professional selection and technical support for customers!
