Each product has its own specifications, of course, self-healing fuses are also there, then the fuse specifications how to see it? This is very simple, as long as you know the meaning of the parameters in the specification book, you can clearly and quickly view the self-recovery fuse PTC specifications.
1. IH (holding current): The maximum current that the high-temperature thermistor PTC can hold under the static air environment at 25°C. Under limited environmental conditions, the device can remain indefinitely without going from a low-impedance state to a high-impedance state. (The current through the PTC is not enough to make the PTC self-heating temperature rise above the Curie temperature. Such a current is called an inoperative current, and the maximum value of the inoperative current is called the maximum inoperative current.)
2. IT (Action Current): The minimum steady-state current of a polymer thermistor PTC operating in a limited time at 25°C in a still air environment.
3, Vmax maximum voltage (withstand voltage value): Under the limited conditions, the highest voltage that the polymer thermistor PTC can operate safely. That is, the pressure resistance of the thermistor. Above this value, the thermistor may be broken down and cannot be recovered. This value is usually listed in the voltage value column in the specification.
4, Imax (maximum current) (flow resistance value): The maximum operating current of the safety action of the polymer thermistor PTC, that is, the current value of the PTC. Above this value, the thermistor may be damaged and cannot be restored. This value is listed in the current value column in the specification.
5, Pd (power loss typical value): In the static air environment of 25°C, the total value of power loss after PTC action is obtained by calculating the product of the leakage current flowing through the PTC and the voltage across the thermistor.
6, trip (trip): polymer thermistor PTC in the over-current or ambient temperature increases from low resistance to high resistance value of the conversion process.
7. Ttrip (action time): The time required for the thermistor PTC to complete its operation after the overcurrent occurs. For any particular polymer PTC, the greater the current flowing through the circuit, or the higher the operating ambient temperature, the shorter the operating time.
8, Tr (recovery time): refers to the PTC thermistor after the action of the natural cooling process, measuring the value of the resistance to recover to twice the rated zero power resistor time.
9. Rmin (minimum resistance value): The minimum resistance before the PTC operates in a static air environment at 25°C before it is installed in a circuit.
10. Rmax (maximum resistance value): The maximum resistance before the PTC operates at 25°C in still air before it is installed in the circuit.
11. Ambient temperature: The temperature of still air around the thermistor PTC or a circuit with a thermistor PTC element.
12. Maximum operating ambient temperature: The maximum ambient temperature at which PTC components are expected to operate safely.
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