Below is some of the terminology manufacturers use in their data sheets as well as references. Fuses with hold currents in the range of a few hundred milliamps to tens of amps are available. Trip currents are typically twice that of hold currents. Hold current and trip currents decrease with increasing temperature as shown in Figure 1 below. I H constant 2 .
Values range from a few milliohms to a few ohms.
Fuses with larger trip currents have smaller initial resistance. This may be 2-4 times higher than the initial resistance. Thus, the trip time must be accompanied with the corresponding overcurrent, which is typically five times the trip current. Trip times for PPTC fuses range from 4 s to 20 s. Generally speaking, fuses with larger trip currents have longer trip times.