How to choose the right fuse? Can restore the fuse selection of essential factors
Operation of the fuse can be restored
From the electronic design and manufacture can recover fuse, according to the company made a number of polymer positive temperature coefficient (PPTC) recovery fuse material patents, by research and development. To protect the circuit from the two sides of the (PPTC) material by electrode or wire. Under normal operating conditions, the resistance value at a very low state (micro Ohm), current can be normal through the recoverable fuse (PPTC) components; but when over current condition, recovery fuse (PPTC) so that the electric heating element resistance rapid rise. When the resistance value rises to almost insulating state, the current circuit will cut off, to other institutions and the element protection circuit, overcurrent condition until removal, recovery fuse (PPTC) element after cooling, its resistance value is reduced to its initial value. At this point, the fuse (PPTC) can be restored to a state that can be passed through again.
Can be used to restore the fuse of the necessary factors: jump off current (IT), the working current (IH) thermal decay effect (Derating Thermal)
From the electronic recovery fuse the tripping current (IT) and current (IH) value is defined in the environment condition under 23 centigrade. Generally, the jump off current is about two times of the working current. From the electronic recovery fuse (PPTC) products in the normal operating current (IH) or lower working current environment, and will not enter the open / jump condition; and the current off at higher jump (IT) is to jump off state.
However, due to the characteristics of polymer materials, the current working current will change with the change of ambient temperature. For example, the following figure shows that the current will be reduced to 23 degrees Celsius 50% degrees Celsius, while the temperature of -40 degrees Celsius, the current will rise to 150% degrees Celsius 23.
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