ptc-100 programmable thermal controller manual.Electrical testing process for self restoring fuses

　　I hold current

　　I hold, high non operating current (maintenance current), refers to the high current that PPTC always maintains its low resistance state at the specified ambient temperature (priority 25 ℃).

　　I hold: maintain current;

　　V max: withstand high voltage;

　　T trip: specifies the large action time under the current;

　　R: Zero power resistance measured at a certain temperature;

　　I trip: action current;

　　I max: The maximum current that can be withstood;

　　P d: steady-state power consumption in high resistance state;

　　R 1max.: The high resistance value measured at room temperature after one hour of action or soldering.

　　Let's take a look at the internal structure of the device, as shown in Figure 4. Place the test sample in a specified temperature and condition test box, connect the PPTC to a constant current or constant voltage source, and preset the current value to the specified I hold, with the voltage limited to 90% of V max. After the specified time in the detailed specifications, measure the voltage at both ends of the PPTC and record it. The PPTC should not enter the operating state.

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