Laboratory-Based Investigation of Contactors Susceptibility to Short Duration Voltage Sags
A. Fioravanti, A. Credo, E. Fiorucci, S. Mari, A. Prudenzi and A. Silvestri Department of Industrial and Information Engineering and Economics. University of L’Aquila, L'Aquila (Italy) 2026-01-20

Abstract

Voltage sags pose substantial challenges in electrical systems, disrupting power supply and adversely impacting equipment. This paper outlines the issues arising from voltage sags, emphasizing their detrimental effects on electrical installations powered by relays and contactors. The study delves into the susceptibility of these critical components when faced with voltage fluctuations, exploring how sags influence their functionality. Additionally, the research presents experimental results from laboratory tests, focusing on contactors of different power exposed to voltage sags lasting less than one cycle. These assessments provide insights into the performance of contactors under short-duration voltage variations, offering valuable contributions to enhancing the reliability of electrical systems.

Key words: Short Duration Voltage Sags; Contactor; Susceptibility; Power quality; Voltage tolerance curve.

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