Hold current Ih: hold current is self - fuse series macromolecule PTC thermistor maintains the maximum current that can pass through without action. Under the condition of limited environment, the device can be kept for a long time without changing from the low resistance state to the high resistance state.
Action current It: in a limited environment, the minimum steady state current of the polymer thermistor in a limited time is made.
Maximum current Imax: (current value) in a limited state, self - complex fuse series polymer PTC thermistor safety action of the maximum operating current, that is, the heat resistance of the flow resistance. Over this value, the thermal resistance is likely to be damaged and cannot be recovered.
Consumption efficacy of Pdmax: in the circuit under normal operating conditions of the polymer self recovery fuse in the circuit consumed by the effectiveness of.
Maximum working resistance Vmax: high molecular self recovery fuse work can withstand the voltage, if the voltage is too high, then since the recovery of the fuse device is likely to circuit protection failure or error protection.
The maximum withstand voltage Vmaxi: polymer self recovery fuse voltage components can withstand the maximum, if the voltage exceeds the value of self recovery fuse components is likely to damage failure, can not effectively protect the circuit.
Initial resistance Rmin: before being mounted to the circuit in the condition of the environment temperature is 25 DEG C under test, since the complex polymer PTC thermistor fuse series resistance.
Rmax: the initial maximum resistance at room temperature, resettable fuse series polymer PTC thermistor action or reflow soldering installation to the maximum resistance after an hour in the circuit board measured value. What is the relationship between IH and IT? Why is the difference? The relationship between IT and IH is the 2:1 of most of our products. Some products may be as low as 1.7:1 while others may be as high as 3:1. Materials, processing methods and the different forms of heat resistance of the IT and IH are different. The actual ratio of most of our products is 2:1.
What‘s the difference between Rmin, Rmax and Rl?
In the specified conditions (e.g., 20 degrees C), the resistance values of the pre specified self recovery fuse are in a range of values, that is, between the minimum (Rmin) and the maximum (Rmax). High polymer PTC thermistor at room temperature action after the end of 1 hours after the resistance of the maximum value or welding to the circuit board one hour after the resistance value of Rl.
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