Overcurrent circuit protection can be achieved by using traditional fuses or using self recovery and self recovery fuses developed by *. Both achieve protection by reacting to the heating phenomenon generated by excessive current in the circuit. Fuses break the current by blowing, while self restoring fuses rely on changing from a low resistance state to a high resistance state to limit the magnitude of the current. Fully understanding the performance differences between the two devices will make it easier for you to choose a circuit protection scheme.
The difference between the two is that the self recovery fuse can self recover. The general self recovery step after overload is to cut off the power supply and cool the device. There are other differences in operational characteristics between the two products. The terminology used for self restoring fuses is usually similar to that used for fuses, but not entirely consistent. For example, the parameters of leakage current and breaking rating belong to this category.
Leakage current: When overloaded, the self recovery fuse changes from a low resistance state to a high resistance state, which is commonly referred to as "tripping". Limit the current to a certain leakage level to achieve the purpose of protection. The leakage current can increase from about 100 milliamperes at rated voltage to several hundred milliamperes at lower voltage. However, for fuses, when overloaded, the fuse blows and completely cuts off the current, resulting in a leakage current of "0" in the disconnected circuit.
Breaking current: The specified short-circuit current of a self restoring fuse at rated voltage. The fault current is the current that the device can withstand, and the self recovery fuse generally does not actually cut off the current. The standard short circuit rated current of the self recovery fuse is 40A. And in response to overload, the fuse must actually cut off the current. The rated breaking current range is large at rated voltage, ranging from hundreds of amperes to 10000 amperes.
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