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IEC 61643-1 specified the requirements and test methods for surge protective devices connected to low-voltage power distribution systems. The standard defined what a surge protective device must achieve rather than how it should be built, and it established the characteristics by which the devices are described and compared: the maximum continuous operating voltage, the nominal discharge current, the maximum discharge current, the voltage protection level under a given impulse current and the temporary overvoltage withstand. The test programme was designed to demonstrate both that the device protects the equipment behind it and that it survives the duty it is called upon to perform, and it included the determination of the voltage protection level, the impulse current withstand tests at increasing severity, the verification of the thermal stability in the presence of a superimposed power frequency voltage, the test of the disconnector that removes a failed device from service, and the mechanical and enclosure tests. The document has been superseded by the restructured IEC 61643-11, which addresses the same devices with revised classifications.

IEC 61643-1 standard satisfiable test: Surge Immunity 、 Impulse Voltage Testing 、 High-current impulse test 。
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