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Electrical
editAir gaps are also used in electrical work, to provide certainty that the circuit is interrupted. Electronic switches that don't involve relays rely on semiconductors to cut the circuit, and if the semiconductors fail in the right way the circuit might not be cut. Electrical safety codes for household electrical devices often (always?) require an auxiliary switch that physically disconnects the circuit.
I don't immediately find another page describing this usage, or I'd just add an entry. Jordan Brown (talk) 23:05, 20 September 2019 (UTC)