The Matching Function of Self Recovery Fuse in Anti Reverse Connection Protection

　　Generally speaking, DC power circuits have protection requirements for anti reverse connection, and in many cases, protection is achieved by connecting anti reverse diodes in series. However, in some cases, anti reflection diodes are not suitable due to the series voltage drop. At this point, the self recovery fuse based on surge protection can be combined with one-way TVS to achieve anti reverse protection. As shown in Figure 6, when the DC power supply is reversed, the unidirectional TVS is directly connected, generating overcurrent, causing the to act quickly and limit the current. When applying this scheme, it is also necessary to consider the withstand voltage of and the power of TVS.

　　self recovery fuses are widely used for overcurrent protection in power lines, communication lines, and various I/O input and output ports of electronic products in communication, security, industrial, automotive, consumer and other fields. It can effectively prevent product damage due to short circuits and high series currents. Moreover, compared to ordinary fuses, the recoverability of eliminates the hassle of subsequent maintenance, repair, and replacement. The following figure shows a common overcurrent protection circuit

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