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What are the main reasons that affect the tripping of surge protection device? Sep 04 , 2025
The tripping of a surge protective device (SPD) is a response to a fault condition by its built-in safety mechanism. Essentially, it disconnects the device from the circuit through mechanical or electronic means to prevent the fault from escalating. Its tripping behavior is directly related to the characteristics of the SPD's core components, surge parameters, system operating conditions, and envi...
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What are the differences in parameter requirements between UL and IEC standards for surge protection devices? Sep 24 , 2025
The UL 1449 standard for surge protective devices (SPDs) in North America differs significantly from the internationally accepted IEC 61643-11 standard in terms of parameter requirements and testing concepts. This profoundly reflects the different emphases on electrical safety and surge protection in different regions. These differences are primarily reflected in core test waveforms, key performan...
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What is the difference in failure mode between voltage-limiting SPDs and switching SPDs? Sep 30 , 2025
Failure modes of voltage-limiting SPDs (varistors) As a core component of voltage-limiting SPDs, varistor (MOV) failure modes primarily stem from the material's physical properties and electrical stress. The primary failure mode is short-circuit failure and its derivative thermal breakdown. When subjected to surge currents exceeding their tolerance (a single, large energy event or multiple, cumula...
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