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Thyristor Surge Suppressors Referred to as TSS; also known as SIDACtor. TSS is a kind of overvoltage protection device, which is made by using the principle of Thyristor. It relies on the breakdown current of the PN structure to trigger the device’s conduction and discharge, which can flow a large surge pulse current. Compared with the TVS of the same size, the TSS has a larger surge pulse current tolerance and a lower capacitance value. It can be used in the signal line instead of the TVS to obtain a higher surge protection level.