fails closed

A form of fail closed — Of an access control system: to automatically block all traffic in the case of a failure. For example, an electronic safe becoming impossible to unlock in the event of a power outage.

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Meanings

verb
  1. indicativepresentsingularthird personthird-person singular simple present indicative of fail closed
Cite this entry
APA

fails closed. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/fails%20closed

MLA

“fails closed.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/fails%20closed. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “fails closed,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/fails%20closed.

Source: fails closed on Wiktionary, CC BY-SA 4.0.